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Choose the word or the phrase or sentence that best completes each unfinished sentence below or that best keeps the meaning of the original sentence if it is substituted for the underlined word or phrase.
1. They ... in that house for several months
A. live B. lived C. have lived D. are living
2. Lan and Maryam are penpals. They ... each other twice a month
A. writing B. write C. has written D. wrote
3. A: Would you like to have lunch with us ? B: ..........
A. All right B. Yes, I would C. No, I wouldn't like D. Yes, I'd love to
4. A: Congratulations on your winning. B: ..........
A. You're welcome B. That's very kind of you C. No, thanks D. Yes, of course
5. A: Shall I get a taxi for you ? B: ..........
A. Yes, I'd love to B. Oh, that would be nice C. Let's do D. Yes, why not ?
6. A: Could you mail this letter for me, please ? B: ...........
A. No, I could't B. I'll try C. Yes, here it is D. I'm sorry, I can't
7. A: How about going out to dinner tonight ? B: ..........
A. Oh, thank you B. Yes, please C. No, I don't want to D. I'm afraid not
8. Family members who live apart try to be together at Tet
A. beside B. away C. near D. close
9. Would you mind lending me your bike ?
A. Yes, here it is B. No, not at all C. Yes, let's D. Good idea
10. Why don't we go for a picnic this weekend ?
A. What do you suggest ? B. Yes, please C. How's that ? D. That's a good idea
11. She often goes ... church to pray because her religion is Islam
A. on B. at C. of D. to
12. That teacher is a (n) ... one. His pupils like his sense of humor
A. amusing B. amused C. amusement D. self - amused
13. The class is ... control because of the game
A. off B. away from C. out of D. below
14. Give her a telephone to ring ... she gets lost
A. whether B. unless C. untill D. incase
15. The party, at ... I was the guest honor, was extremely enjoyable
A. where B. that C. who D. which
16. The children ... to the zoo
A. were enjoyed take B. enjoyed being taken C. were enjoyed taking D. enjoyed taking
17. Go and get me some coffee, .......... ?
A. shall we B. shan't we C. will you D. won't you
18. He was unwilling to explain the reason ... his absence
A. why B. for C. of D. that
19. I'd have told you if I ... the book
A. had seen B. should have seen C. saw D. would have seen
20. He was so tired that he wasn't capable ... driving himself home
A. to B. for C. of D. from
Choose the word or the phrase or sentence that best completes each unfinished sentence below or that best keeps the meaning of the original sentence if it is substituted for the underlined word or phrase.
1. They ... in that house for several months
A. live B. lived C. have lived D. are living
2. Lan and Maryam are penpals. They ... each other twice a month
A. writing B. write C. has written D. wrote
3. A: Would you like to have lunch with us ? B: ..........
A. All right B. Yes, I would C. No, I wouldn't like D. Yes, I'd love to
4. A: Congratulations on your winning. B: ..........
A. You're welcome B. That's very kind of you C. No, thanks D. Yes, of course
5. A: Shall I get a taxi for you ? B: ..........
A. Yes, I'd love to B. Oh, that would be nice C. Let's do D. Yes, why not ?
6. A: Could you mail this letter for me, please ? B: ...........
A. No, I could't B. I'll try C. Yes, here it is D. I'm sorry, I can't
7. A: How about going out to dinner tonight ? B: ..........
A. Oh, thank you B. Yes, please C. No, I don't want to D. I'm afraid not
8. Family members who live apart try to be together at Tet
A. beside B. away C. near D. close
9. Would you mind lending me your bike ?
A. Yes, here it is B. No, not at all C. Yes, let's D. Good idea
10. Why don't we go for a picnic this weekend ?
A. What do you suggest ? B. Yes, please C. How's that ? D. That's a good idea
11. She often goes ... church to pray because her religion is Islam
A. on B. at C. of D. to
12. That teacher is a (n) ... one. His pupils like his sense of humor
A. amusing B. amused C. amusement D. self - amused
13. The class is ... control because of the game
A. off B. away from C. out of D. below
14. Give her a telephone to ring ... she gets lost
A. whether B. unless C. untill D. in case
15. The party, at ... I was the guest honor, was extremely enjoyable
A. where B. that C. who D. which
16. The children ... to the zoo
A. were enjoyed take B. enjoyed being taken C. were enjoyed taking D. enjoyed taking
17. Go and get me some coffee, .......... ?
A. shall we B. shan't we C. will you D. won't you
18. He was unwilling to explain the reason ... his absence
A. why B. for C. of D. that
19. I'd have told you if I ... the book
A. had seen B. should have seen C. saw D. would have seen
20. He was so tired that he wasn't capable ... driving himself home
A. to B. for C. of D. from
1. This is the latest news _____ you might want to know.
A. who B. it C. that D. what
2. During the past few years she _____ on her small salary.
A. lives B. is living C. would live D. has lived
3. By the time you came, the meal _____
A. would have been prepared B. have been prepared C. had been prepared D. will have been prepared
4. They don't like foreign films, _____ ?
A. don't they B. do they C. will they D. won't they
5. Although it was so late at night, they kept _____ a conversation with me.
A. carry on B. carrying on C. talking D. taking
6. I _____ the weather because I had been living there for a long time.
A. are used to B. was used to C. used to D. didn't use to
7. I wished I _____ the front door open last night.
A. didn't leave B. hadn't left C. haven't left D. wouldn't have left
8. If I were you, I _____ all the money
A. lose B. didn't lose C. wouldn't lose D. wouldn't have lost
9. Foreign tourists would like to travel in Vietnam because Vietnamese people are very friendly _____ them.
A. to B. of C. with D. about
10. _____ the price of petrol has risen, we are going to use the motorbike instead of the car.
A. In order of B. Because C. Despite D. Unless
1. You have never been to Ha Long Bay, ..................?
A. have you B.haven't you C. you have D. you haven't
2. If only I .............play the guitar as well as you
A. would B. shall C. could D. might
3. There's no need to be nervous .You're quite capable ............your final exam
A. of passing B.passing C. to pass D. pass
4. As she arrived at the theatre ,she remembered that she............to meet a friend somewhere else
A. promised B. had promised C. has promised D. promised
5. ''Does Jack know about your project '' .''Yes, I told him..................to do''
A. what was I planning B. what I have planned
C. what did I plan D. what I was planning
6. If you have finished the test ,you.................the room
A. would B. may laeve C. may be laeving D. could laeve
7. I wish you ....................me how to do this excise
A. can help B. will help C. could help D. should help
8. The chidren.................to the zoo
A. were enjoyed taken B. enjoyed being taken
C. were enjoyed taking D. enjoyed taking
9. I ..................detective stories but I don't anymore
A. was enjoyed taken B.was used to enjoy
C. were enjoyed taking D. enjoyed taking
10. It was ..............an interesting book that he couldn't put it down
A. very B.enough C.such D. so
11. We welcome you to our city .You.........to our city
A. welcome B.are welcome C.have wecomed D.are welcoming
12. The floor in the room was to was so dirty as if it................for days
A. hadn't swept B.hadn't been swept
C. haven't been swept D. wouldn't have swept
1. You have never been to Ha Long Bay, ..................?
A. have you B.haven't you C. you have D. you haven't
2. If only I .............play the guitar as well as you
A. would B. shall C. could D. might
3. There's no need to be nervous .You're quite capable ............your final exam
A. of passing B.passing C. to pass D. pass
4. As she arrived at the theatre ,she remembered that she............to meet a friend somewhere else
A. promised B. had promised C. has promised D. promised
5. ''Does Jack know about your project '' .''Yes, I told him..................to do''
A. what was I planning B. what I have planned
C. what did I plan D. what I was planning
6. If you have finished the test ,you.................the room
A. would B. may laeve C. may be laeving D. could laeve
7. I wish you ....................me how to do this excise
A. can help B. will help C. could help D. should help
8. The chidren.................to the zoo
A. were enjoyed taken B. enjoyed being taken
C. were enjoyed taking D. enjoyed taking
9. I ..................detective stories but I don't anymore
A. was enjoyed taken B.was used to enjoy
C. were enjoyed taking D. enjoyed taking
10. It was ..............an interesting book that he couldn't put it down
A. very B.enough C.such D. so
11. We welcome you to our city .You.........to our city
A. welcome B.are welcome C.have wecomed D.are welcoming
12. The floor in the room was to was so dirty as if it................for days
A. hadn't swept B.hadn't been swept
C. haven't been swept D. wouldn't have swept
A. Choose the word or phrase (a, b, c or d) that best fits the blank space in each sentence. the
1. If there is a mechanical problem, we suggest the manufacturer directly.
a, contact b. to contact ontacting d. be contacted
2. no battery could store................. to turn over a car's engine.
d. more energy a. much energy b. energy enough c. enough makes d. would come
3. The cost of solar power needs................ before it on makes an impact on the energy market.
a. fall b. to fall c. falling d .to be fallen
4. Don't forget to bring my dictionary when you............back tomorrow
b. will come c. are coming a. come d would come
5. Study harder.................
a. if you will fail the exam b. and you will fail the exam c. unless you' will fail the exam d. or you will fail the exam
6. They have to clean the whole area before dark,.............?
d. haven't they a. do they b. don't they c. have they
7. My car isn't very reliable. It keeps ...........
a. break down b. on break down d. to break down c. on breaking down
8. If we............... less paper, we............ trees in the forest.
b. will use. can save d. use/ can save a. used/ will save c. can use/ save
9. There's always litter here. No one ever............
c. pick up d. pick it a. pick up it b. pick it up
10. 'Should I begin typing these letters?' 'I suggest ...............the bookkeeping first.'
a .you finished b. you to finish c. you finish d. you will finish
Complete the sentences using the words in bold . Use two to five words
1. will you ever think about finding a flat of your own ?
time it's ...............time you thought........................................about finding a flat of your own
2. look at how he lives-he thinks he's a millionaire
if he lives .....as if he were.............................................a millionaire
3. this summer , i would rather book a holiday in Monaco than Lyons
prefer this summer , i .................prefer to book..............................................a holiday in Monaco rather than Lyons
4. why didn't you tell me yourself that you were leaving ?
rather i'd.........rather you told............................................me yourself that you were leaving
5. she wants to be more like her mother
wishes she..........wishes she were.....................................................more like her mother
6. i should have taken that job in canada last year
only if.....................................................................that job in canada last year
7. you should have checked the oil before you set out
better it...........'s better.............................................................you had checked the oil before you set out
8. i was about to buy the painting , when i realised it was a fake
if i would have brought the painting ................if I hadn't realised.......................................it was a fake
9. i didn't see the tv programme because i didn't know it was on
known if.................i had known.....................................the tv programme was on , i would have seen it
10. i think you should go on holiday
were if........i were you......................................................, i would go on holiday
11. you shouldn't have told Sally my secret
told i'd.......................rather you hadn't told...................................... Sally my secret
12. you'd think he was a politician
though he behaves.............as though he were............................................................. a politician
13. you should be in bed now. it's late
went it's.......time you went...............................................................to bed
14. it would have been better if you had passed on the message
only if.......only ...you had passed on........................................................the message
15. if the teacher asked you to answer that question , what would you say?
asked suppose.......that you were asked.................................................to answer that question , what would you say/
16. it's a pity it's a raining
stop i..............wish it would stop......................................................................raining
17. she couldn't tell you because she didn't know
would had..........she known, she would have...........................................................told you
18. why did i listen to John? he always tells lies
listened if...................................................................to John. he always tells lies
19. we should have left by now if we don't want to miss the bus
time it's..........time we left .....................................................if we don't want to miss the bus
20. i would have liked you to have informed my parents about my change of plan
rather i........would rather you had informed..................................................................my parents about my change of plan
21. it would have been better if they had got the earlier train
only if.........only they had got........................................................................the earlier train
22. you ought to have set a wedding date by now
time it's.......time you had set.............................................................a wedding date
Complete the sentences using the words in bold . Use two to five words
1. will you ever think about finding a flat of your own ?
time it's ......time you thought............about finding a flat of your own
3. this summer , i would rather book a holiday in Monaco than Lyonsprefer this summer , i ...prefer book.....a holiday in Monaco rather than Lyons
4. why didn't you tell me yourself that you were leaving ?
rather i'd.........rather you told...........me yourself that you were leaving
5. she wants to be more like her mother
wishes she............wishes he were .....................more like her mother
7. you should have checked the oil before you set out
better it.....had better...you had checked the oil before you set out8. i was about to buy the painting , when i realised it was a fake
if i would have brought the painting .....if i had realised.....it was a fake
9. i didn't see the tv programme because i didn't know it was on
known if..had known..the tv programme was on , i would have seen it
10. i think you should go on holiday
were if................I were you..........................., i would go on holiday
11. you shouldn't have told Sally my secret
told i'd....................better you told............................ Sally my secret
13. you should be in bed now. it's late
went it's...................time you went.....................................to bed
16. it's a pity it's a raining
stop i..................wish it would stop..............................raining
17. she couldn't tell you because she didn't know
would had.............she known,shw would have...............told you
19. we should have left by now if we don't want to miss the bus
time it's..........time we will have left by now.................if we don't want to miss the bus
20. i would have liked you to have informed my parents about my change of plan
rather i..........would rather you had informed.......my parents about my change of plan
22. you ought to have set a wedding date by now
time it's..............time you had set.................a wedding date
I. 1...................you are interested in this film, don't go to see it at any cost. A.if B. Unless C. Because D. So 6. If you like that book, I will give it .................you as my present D. to A. for B. from C. at 7. If you live in this small town, you................earn much money
A. aren' B. couldn't C. can't D. didn't 8. If you have .....................money, you can travel abroad this summer D. a lots A. a lot of B. many C. lot of 9. If you are a student, you can get a discount .....................books A. on B. in C. at D. for 10. I won't go unless you ..............me the money back A. to pay B. paid C. paying D. pay II. simply -dirt-health- importance-quick-poison We are all destroying the earth. The seas and rivers are too (1).....dirt..............to swim in. There is so much smoke in the air that it is (2).................. to live in many of the world's cities. In one well-known city, for example, (3)........poison...... gases from cars poilute the air so much that policemen have to wear oxygen masks. We have cut down so many trees that there are now vast areas of wasteland all over the world. As a result, famers in parts of Africa can not grow enough to tat. in certain countrics in Asia there is so little rice. Moreover, we take enough care of the countryside. Wild animals are (4).....quick........ disappearing. For instance, igers are rare in India now because we have killed too many for them to survive. However, it isn't so (5) .....importance...........to talk about the problem. We must act now before it is too late to do anything about it. Join us now Save the Earth. This is too (6)......simply....... to ignore
I. 1...................you are interested in this film, don't go to see it at any cost.
A.if B. Unless C. Because D. So
6. If you like that book, I will give it .................you as my present
D. to A. for B. from C. at
7. If you live in this small town, you................earn much money
A. aren' B. couldn't C. can't D. didn't
8. If you have .....................money, you can travel abroad this summer
D. a lots A. a lot of B. many C. lot of
9. If you are a student, you can get a discount .....................books
A. on B. in C. at D. for
10. I won't go unless you ..............me the money back
A. to pay B. paid C. paying D. pay
II. simply --health- importance-quick-poison
We are all destroying the earth. The seas and rivers are too (1).........dirty..........to swim in. There is so much smoke in the air that it is (2).........unhealthy......... to live in many of the world's cities. In one well-known city, for example, (3)...... poisonous ........ gases from cars poilute the air so much that policemen have to wear oxygen masks. We have cut down so many trees that there are now vast areas of wasteland all over the world. As a result, famers in parts of Africa can not grow enough to tat. in certain countrics in Asia there is so little rice. Moreover, we take enough care of the countryside. Wild animals are (4).....quickly........ disappearing. For instance, igers are rare in India now because we have killed too many for them to survive. However, it isn't so (5) .....simply...........to talk about the problem. We must act now before it is too late to do anything about it. Join us now Save the Earth. This is too (6)......important....... to ignore
5. Jack has a good memory. He can learn these vocabulary items _____ easily.
A. with heart B. in mind C. by heart D. of mind
6. It's difficult to remember these grammar rules. ~ Oh, try to do all _____ exercises in this grammar book.
A. learning B. studying C. working D. grammar
7. Use a _____ to check up the words you want to know about.
A. book B. magazine C. dictionary D. newspaper
8. What time does your English class _____ and end?
A. start B. open C. leave D. get
9. First we have to pass the written _____, then we take the oral exam.
A. questions B. quiz C. exam D. form
10. I like learning languages. I want _____ an extensive course of English.
A. to come B. to attend C. to get D. to have
11. I think we can practice our listening and speaking skills by _____.
A. joining an English speaking club B. watching English programs
C. speaking English with friends D. All are correct12. Do you happen to know the name of the _____?
A. examination B. examiner C. exam D. examining
13. Of course as a student I want _____ all the exams.
A. to pass B. to fail C. to get D. to do
14. What _____ of learning English do you find most difficult? Is it grammar rules or speaking?
A. type B. form C. kind D. aspect
15. My sister hair isn't _______
A. fast B. curly C. slim D. sociable
16. He likes telling jokes. He has a sense of ___________.
A. orphan B. neighbor C. volunteer D. humor
17. Everybody loves him because of his good __________.
A. character B. person C. member D. public
18. The sun _________ in the east.
A. rise B. rises C. rose D. risen
19. My friends prefer _________ outside the classroom.
A. to be B. was C. being D. are
20. Each of us __________ different character.
A. have B. has C. have had D. had
21. Are you _________ lift the table.
A. enough strong to B. strong enough to C. too strong to D. too strong
22. What is your Dad _________?
A. look like B. alike C. like D. likely
23. Most of us spend time __________ sports in summer.
A. play B. to play C. playing D. played
24. My pen-friends love __________ the countryside.
A. in B. at C. on D. from
25. Lan introduces her Mom __________ new friends.
A. with B. of C. to D. in
26. She'll be here ________ Christmas.
A. at B. on C. in D. during
27. I suggest that you __________work harder on your pronunciation.
A. can B. should C. would D. could
28. I suggest using energy-saving bulb__________ our electricity bill
A. to reduce B. reducing C. reduces D. reduced
29. The__________ coast can expect thunderstorm.
A. central - south B. south - central C. center south D. south middle
30. Trang has just won the first prize in the __________ contest.
A. speaking-English B. English speaking C. English spoken D. spoken English31. I got up late in the morning because my a larm clock didn't__________
A. go off B. get off C. put off D. come off
32. Solar panels__________ on the roof of a house to receive the energy from the sun
A. is put B. is installed C. are putting D. are installed
32. Energy-saving bulbs should be used__________ electricity.
A. save B. saving C. to save D. to saving
33. Mrs. Mi suggests__________ showers to save water.
A. making B. take C. make D. taking
34. That 's wonderful. I'm pleased __________ you are working hard.
A. with B. that C. what D. where
35. He dedicates all his life to __________ the environment.
A. protecting B. protected C. making D. taking
36. If we pollute the water, we will have no __________ water to use.
A. hot B. cold C. cool D. fresh
37. We want people to be aware__________ problem of pollution.
A. to B. in C. of D. with
38. If you __________ find your place, I will help you get there with this map.
A. can't B. can C. couldn't D. could
39. We couldn't keep__________ cleaning the beach because it started to rain.
A. about B. on C. at D. with
40. He denied__________ her last night.
A. meet B. to meet C. meting D. meeting
41. There are many__________ which internet users have to suffer
A. dangerous B. risks C. poisons D. badly
42. Let's go to the cinema, __________?
A. don't we B. don't they C. do we D. shall we
43. Oh dear ! How __________ our household bills are ! We can't pay them.
A. heavy B. enormous C. small D. low
44. In winter, heating _________ for 50 percent of our electricity bill.
A. takes B. occupies C. accounts D. costs
45. Energy can be collected by solar __________ on cloudy days.
A. boards B. panels C. bars D. sheets
46. If we don't find _____ sources of power, we will use up all the fossil fuels in the near future.
A. effective B. efficient C. natural D. alternative
47. We want to use solar energy, __________ it cannot be used on cloudy days.
A. but B. so C. because D. however
48. Are wind power ___________ solar power new kinds of energy for future use?
A. and B. or C. with D. but
49. He is always broke, He can afford neither luxuries ________ basic necessities.
A. or B. nor C. and D. but
50. Her husband bought not only two energy-saving light bulbs but _______ one cheap washing machine last Sunday.
A. also B. too C. as well D. some
12. Do you happen to know the name of the _____?
A. examination B. examiner C. exam D. examining
32. Solar panels__________ on the roof of a house to receive the energy from the sun
A. is put B. is installed C. are putting D. are installed
Chị kiên nhẫn thật sự :vv
1. Fortunately, I .... working alone otherwise I would have got really bored at the night shift.
A) was supposed to
B) was to
C) was used to
D) would
E) used to
2. I don't think it was a good idea to intervene, instead, you .... your child to abandon the habit of thumb-sucking gradually, all by himself.
A) have allowed
B) had allowed
C) must have allowed
D) were able to allow
E) could have allowed
3. After the voyaging ship was wrecked during a storm at sea, unfortunately, only two of the men on board .... swim to the small island nearby.
A) might
B) were supposed to
C) could
D) were able to
E) had to
4. I don't know why she didn't ask me how to do it as I ---- her.
A) must have helped
B) could have helped
C) might help
D) should have helped
E) could help
5. Martin ---- my tennis racket without asking my permission. I got really angry with him.
A) needn't have taken
B) must not have taken
C) shouldn't have taken
D) didn't need to taken
E) might not have taken
6. I don't know why Peter is so late; do you think he ---- lost coming here?
A) may get
B) could get
C) must have got
D) might have got
E) was to have got
7. What ---- to Phil? He said he ---- here at eight o'clock.
A) might have happened / will be
B) should have happened / has been
C) may happen / will have been
D) would happen / is
E) can have happened / would be
8. One of the US national security advisers ---- there ---- better intelligence sharing before the September 11 attacks.
A) had acknowledged / can be
B) acknowledges / might be
C) has acknowledged / could have been
D) acknowledged / must be
E) would acknowledge / will have been
9. We all think that Maria ---- an interesting person to meet as we ---- a lot of stories about her so far.
A) is / had heard
B) can be / heard
C) might have been / hear
D) would be / have heard
E) will be / will have heard
10. As a young woman who had never given birth before, she ---- what the experience of childbirth ---- like.
A) doesn't know / will be
B) may not know / is
C) must not have known / will be
D) may not know / would be
E) couldn't have known / would be
1. Fortunately, I .... working alone otherwise I would have got really bored at the night shift.
A. was supposed to
B. was to
C. was used to
D. would
E. used to
2. I don't think it was a good idea to intervene, instead, you .... your child to abandon the habit of thumb-sucking gradually, all by himself.
A. have allowed
B. had allowed
C. must have allowed
D. were able to allow
E. could have allowed
3. After the voyaging ship was wrecked during a storm at sea, unfortunately, only two of the men on board .... swim to the small island nearby.
A. might
B. were supposed to
C. could
D. were able to
E. had to
4. I don't know why she didn't ask me how to do it as I ---- her.
A. must have helped
B. could have helped
C. might help
D. should have helped
E. could help
5. Martin ---- my tennis racket without asking my permission. I got really angry with him.
A. needn't have taken
B. must not have taken
C. shouldn't have taken
D. didn't need to taken
E. might not have taken
6. I don't know why Peter is so late; do you think he ---- lost coming here?
A. may get
B. could get
C. must have got
D. might have got
E. was to have got
7. What ---- to Phil? He said he ---- here at eight o'clock.
A. might have happened / will be
B. should have happened / has been
C. may happen / will have been
D. would happen / is
E. can have happened / would be
8. One of the US national security advisers ---- there ---- better intelligence sharing before the September 11 attacks.
A. had acknowledged / can be
B. acknowledges / might be
C. has acknowledged / could have been
D. acknowledged / must be
E. would acknowledge / will have been
9. We all think that Maria ---- an interesting person to meet as we ---- a lot of stories about her so far.
A. is / had heard
B. can be / heard
C. might have been / hear
D. would be / have heard
E. will be / will have heard
10. As a young woman who had never given birth before, she ---- what the experience of childbirth ---- like.
A. doesn't know / will be
B. may not know / is
C. must not have known / will be
D. may not know / would be
E. couldn't have known / would be
1. She complains noisily about anything____she doesn't like.
A. what B. that
C. about which. D. whose
2. "Would you like a glass of green tea?" - "_____"
A. No, let's not B: No, I don't
C. No, thanks D. No, I wouldn't 3. Mr. Long often goes swimming_____Sunday mornings.
A. in B. on C.until D.at
4. We're good friends. We______each other since we were in primary school.
A. know B. have known
C. have been known D. knew
5. The final match_____on June 30th.
A. will be occurred B. takes place C. happening D. is going
6. Today our teacher gives us some_____on how to save energy at home.
A. advice B. advise
C. advises D. advised
7. Don't throw trash onto the water.____you want to make the environment polluted.
A. unless B. though
C. because D.if
8. It is essential that teachers______friendly to students.
A. should B. be
C.ought to D. are