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20 tháng 11 2017

Fill in each blank with a suitable word
1.It's a small is island, 4 miles .....off... the Thai coast.
2.I know her ....by....

sight, but I've never talked to her.
3. ....on..... be half of everyone here tonight, I'd like to thank you .....for..... your advice.
4.You can refer ....to...... these documents ......for.... more information.
5.How much did he change you .....for..... doing .....up....the room?
6.She began to talk ....with...... an apology .....\(\varnothing\)..... to audience.

I. Supply the correct form of the given words 1. I didn't know who it was with a mask on. She was completely ___________ ( RECOGNISE ) 2. He regularly writes__________ ( POET ) 3. I enjoy going on long walks for a bit of _______ ( RELAX ) 4. Peter's ___________ got worse as he returned to wear glasses ( EYE ) 5. English is the _____________ language in Singapore ( OFFICE ) 6. Don't be so ___________ . We 've only been waiting for a few minutes ( PATIENT ) 7. In _________ to that, my...
Đọc tiếp

I. Supply the correct form of the given words

1. I didn't know who it was with a mask on. She was completely ___________ ( RECOGNISE )

2. He regularly writes__________ ( POET )

3. I enjoy going on long walks for a bit of _______ ( RELAX )

4. Peter's ___________ got worse as he returned to wear glasses ( EYE )

5. English is the _____________ language in Singapore ( OFFICE )

6. Don't be so ___________ . We 've only been waiting for a few minutes ( PATIENT )

7. In _________ to that, my bike tires were flat ( ADD )

8. The police are investigating the sudden________ of the valuable painting. ( APPEAR )

II. Fill in each gap with an appropriate preposition

1. It's a small island, four mile ................. the Thai coast.

2. I know her ................ sight but I've never talked to her

3. On behalf of everyone here tonight, I'd like to thank you............... your advice.

4. I must refer ....................... the director.

5. She began her talk .....................an apology to the audience.

2
21 tháng 9 2017

I. Supply the correct form of the given words

1. I didn't know who it was with a mask on. She was completely __UNRECOGNISED_________ ( RECOGNISE )

2. He regularly writes_____POEMS_____ ( POET )

3. I enjoy going on long walks for a bit of ___RELAXING____ ( RELAX )

4. Peter's _______EYE-SIGHT____ got worse as he returned to wear glasses ( EYE )

5. English is the _______OFFICIAL______ language in Singapore ( OFFICE )

6. Don't be so ____IMPATIENT_______ . We 've only been waiting for a few minutes ( PATIENT )

7. In _______ADDTION__ to that, my bike tires were flat ( ADD )

8. The police are investigating the sudden___DISAPPEARANCE_____ of the valuable painting. ( APPEAR )

II. Fill in each gap with an appropriate preposition

1. It's a small island, four mile .....OFF............ the Thai coast.

2. I know her ...........BY..... sight but I've never talked to her

3. On behalf of everyone here tonight, I'd like to thank you.....FOR.......... your advice.

4. I must refer .............TO.......... the director.

5. She began her talk ...............WITH......an apology to the audience.

21 tháng 9 2017

I. Supply the correct form of the given words

1. I didn't know who it was with a mask on. She was completely _unrecognised ____ ( RECOGNISE )

2. He regularly writes___poems__ ( POET )

3. I enjoy going on long walks for a bit of ___relaxation____ ( RELAX )

4. Peter's ____eye-sight___ got worse as he returned to wear glasses ( EYE )

5. English is the __official__ language in Singapore ( OFFICE )

6. Don't be so _impatient__ . We 've only been waiting for a few minutes ( PATIENT )

7. In ____addition_____ to that, my bike tires were flat ( ADD )

8. The police are investigating the sudden___disappearance_____ of the valuable painting. ( APPEAR )

II. Fill in each gap with an appropriate preposition

1. It's a small island, four mile ........of......... the Thai coast.

2. I know her .......by..... sight but I've never talked to her

3. On behalf of everyone here tonight, I'd like to thank you.....for.......... your advice.

4. I must refer .....to..... the director.

5. She began her talk ....with ...an apology to the audience.

Fill in each blank with one suitable word: Travelling to all corners of the world is (1)............ easier and easier. We live (2) .......... a global village but how well do we know and underatang each other? Here is (3)............ simple test. Imagine you have arranged a meeting at 4 p.m. What time should you expect your foreign business colleagues to arrive?.If they are German, they'll be exactly (4)............time. If they are American, they'll probably be 15 minutes early. If they are...
Đọc tiếp

Fill in each blank with one suitable word:

Travelling to all corners of the world is (1)............ easier and easier. We live (2) .......... a global village but how well do we know and underatang each other? Here is (3)............ simple test. Imagine you have arranged a meeting at 4 p.m. What time should you expect your foreign business colleagues to arrive?.If they are German, they'll be exactly (4)............time. If they are American, they'll probably be 15 minutes early. If they are British, they'll be 15 minutes (5)............, and you should allow up to an hour for the Indians. Therefore, these are some small advice in (6)............ not tobehave badly abroad. In France, you shouldn't sit down in a café until you are shaken hands with everyone you know. In Afghanistan you'd better spend at last 5 minutes (7)............ hello. In Pakistan,you mustn't wink. It is offensive. In the Middle East you must never use the left hand for greeting, eating, drinking or smoking. Also, you should care not to admire (8)............in your host's home. They will feel that they have to it to you. In Russia you must your host drink for drink or they will think you are unfriendly. In Thailandyou should clasp your hand (9)............and lower yourhead and your eyes when you greet someone .In America you should your hamburger with both hands and as quick as (10)............ .You shouln't try to have a conversation until it is eaten

4
9 tháng 11 2017

Fill in each blank with one suitable word:

Travelling to all corners of the world is (1)......becoming...... easier and easier. We live (2) ......in.... a global village but how well do we know and underatang each other? Here is(3)......a...... simple test. Imagine you have arranged a meeting at 4 p.m. What time should you expect your foreign business colleagues to arrive?.If they are German, they'll be exactly (4)......on......time. If they are American, they'll probably be 15 minutes early. If they are British, they'll be 15 minutes (5).......late....., and you should allow up to an hour for the Indians. Therefore, these are some small advice in (6)......order...... not tobehave badly abroad. In France, you shouldn't sit down in a café until you are shaken hands with everyone you know. In Afghanistan you'd better spend at last 5 minutes(7).......saying..... hello. In Pakistan,you mustn't wink. It is offensive. In the Middle East you must never use the left hand for greeting, eating, drinking or smoking. Also, you should care not to admire (8).....anything.......in your host's home. They will feel that they have to it to you. In Russia you must your host drink for drink or they will think you are unfriendly. In Thailandyou should clasp your hand(9).....together.......and lower yourhead and your eyes when you greet someone .In America you should your hamburger with both hands and as quick as (10)......possible...... .You shouln't try to have a conversation until it is eaten

9 tháng 11 2017

(1) becoming

(2) in

(3) a

(4) on

(5) late

(6) order

(7) saying

(8) anything

(9) together

(10) possible

20 tháng 2 2019

1. You look tired. Sit down and have a cup of tea.

2. I'm looking for yesterday's newspapers. Did you throw it away ?

3. Could i try on these shoes, please? Size nine.

4. Turn off the music. It's too loud!

5. I turned on the radio and listened to the six o'clock news.

6. I used to smoke, but i gave it up last year.

7. Just go along with what you were doing.

8. Pick up you litter! Son't drop it on the street!

9. Don't worry about the baby. I'll look for her while you're out.

10. I'm looking forward to meeting her very much.

11. Who do you take after the most, your father or your mother?

12. I ran into an old friend in the street this morning.

13. 'How do you spell this word?' 'I'm not sure. You'd better look it up in your dictionary.

14. Look up ! The car is coming!

15. The show was called off because of the rain.

18 tháng 9 2022

14. look out ạ, không phải look up

II/ Put the verbs in the brackets in to the correct form V/ TO V/ V-ing 1. I'm afraid Mr Pitt isn't in. Would you like (speak) to speak to his secretary' 2. I call Nhi but she pretended not to hear and went on(do) her work 3. My mother love(cook) 4. Dang,stop(talk)! The class is noisy just because of you 5. I am do the exercises carefully to avoid(make) mistakes 6. I prefer(play) chess to going to the theater 7. Do you mind(move) your chair a bit side? 8. Have you finished(work) on yout...
Đọc tiếp

II/ Put the verbs in the brackets in to the correct form V/ TO V/ V-ing
1. I'm afraid Mr Pitt isn't in. Would you like (speak) to speak to his secretary'
2. I call Nhi but she pretended not to hear and went on(do) her work
3. My mother love(cook)
4. Dang,stop(talk)! The class is noisy just because of you
5. I am do the exercises carefully to avoid(make) mistakes
6. I prefer(play) chess to going to the theater
7. Do you mind(move) your chair a bit side?
8. Have you finished(work) on yout project?
9. Do you enjoy(listen) to Pop music?
10.Quang has always hated(do) his homework
11. My brother spent hours..........(repair) his motorbiker.
12. Don't forget to bring my dictionary when you ..........(come) back tomorrow.
13. You..........(feel) cold if the sun ..........(not shine) .
14. I'm tired after that long walk. I'm not used to..........(walk) so far.
15. Bill never carries money with him. He's afraid of ..........(rob)
16. It is easy (be) wise after the event.
17. Do you (wish) (make) a complaint?
18.We don't (want) anybody (know) that we are here.
19.If you can't (remember) his number you'd better (look) it up.
20. I want her (learn) Esperanto; I think everybody ought to (know) it?21. Visitors are asked (not feed) the animals.
III/ Combine these sentences with who , whom , which.
1. I thanked the woman. She helped me.
2. She is the most intelligent woman. I’ve ever met this woman.
3. The doctor is famous. You visited him yesterday.
4. Do you know the music? It is being played on the radio.
5. These children are orphans. She is taking care of these children.
6. She couldn’t come to the party. This is a pity.
7. The man answered the phone. He said Tom was out.
8. Who is the woman? We met her here last year.
9. Try to read the book . I gave it to you yesterday.
10. A typhoon is a violet tropical storm. It can cause great destruction.

1
5 tháng 3 2020

II/ Put the verbs in the brackets in to the correct form V/ TO V/ V-ing
1. I'm afraid Mr Pitt isn't in. Would you like (speak) to speak to his secretary'
2. I call Nhi but she pretended not to hear and went on(do)doing her work
3. My mother loves(cook) cooking
4. Dang,stop(talk) talking! The class is noisy just because of you
5. I am do the exercises carefully to avoid(make) making mistakes
6. I prefer(play) playing chess to going to the theater
7. Do you mind(move) to move your chair a bit side?
8. Have you finished(work) worked on yout project?
9. Do you enjoy(listen) listening to Pop music?
10.Quang has always hated(do) doing his homework
11. My brother spent hours.repairing....(repair) his motorbiker.
12. Don't forget to bring my dictionary when you .....come.....(come) back tomorrow.
13. You....will feel.....(feel) cold if the sun ....doesn't shine......(not shine) .
14. I'm tired after that long walk. I'm not used to....walking......(walk) so far.
15. Bill never carries money with him. He's afraid of ....robbing......(rob)
16. It is easy (be) to be wise after the event.
17. Do you (wish) wish (make)made a complaint?
18.We don't (want)want anybody (know)know that we are here.
19.If you can't (remember) remember his number you'd better (look)look it up.
20. I want her (learn)to learn Esperanto; I think everybody ought to (knowknow ) it?21. Visitors are asked (not feed)not to feed the animals.
III/ Combine these sentences with who , whom , which.
1. I thanked the woman. She helped me.

=> I thanked the woman who help me
2. She is the most intelligent woman. I’ve ever met this woman.

=> She is the most intelligent woman who I've ever met
3. The doctor is famous. You visited him yesterday.

=> The doctor is famous who you visited yesterday
4. Do you know the music? It is being played on the radio.

=> Do you know the music which is being played on the radio
5. These children are orphans. She is taking care of these children.

=> These children are orphans who she is taking care of

VIII. Fill in the blank with one suitable preposition or adverb. have a cup of tea. 1. You look tired. Sit_________and have a cup of tea 2. I'm looking_______ yesterday's newspaper. Did you throw it _______? 3. Could I try_________these shoes, please? Size nine. 4. Turn _______the music. It's too loud! 5. Don't forget to turn__________ the lights when you come to bed. 6. I used to smoke, but I gave______last year. 7. Just carry________with what you were doing 8. Pick _______ your...
Đọc tiếp

VIII. Fill in the blank with one suitable preposition or adverb. have a cup of tea.

1. You look tired. Sit_________and have a cup of tea

2. I'm looking_______ yesterday's newspaper. Did you throw it _______?

3. Could I try_________these shoes, please? Size nine.

4. Turn _______the music. It's too loud!

5. Don't forget to turn__________ the lights when you come to bed.

6. I used to smoke, but I gave______last year.

7. Just carry________with what you were doing

8. Pick _______ your litter! Don't drop it on the street!

9. Don't worry about the baby. I'll look________her while you're out.

10. I'm looking________ to meeting her very much.

11. Who do you take_______the most, your father or your mother?

12. The test is about to begin. Please put_______all of your books and notebooks

13. 'How do you spell this word?' ' i'm not sure. You'd better louk it_______in your dictionary

15. Tho show was cailed___________because of the rain

2
20 tháng 10 2018

VIII. Fill in the blank with one suitable preposition or adverb. have a cup of tea.

1. You look tired. Sit___down______and have a cup of tea

2. I'm looking____for___ yesterday's newspaper. Did you throw it ___away____?

3. Could I try_____on____these shoes, please? Size nine.

4. Turn ____off___the music. It's too loud!

5. Don't forget to turn______off____ the lights when you come to bed.

6. I used to smoke, but I gave___up___last year.

7. Just carry____on____with what you were doing

8. Pick ___up____ your litter! Don't drop it on the street!

9. Don't worry about the baby. I'll look____after____her while you're out.

10. I'm looking___forward_____ to meeting her very much.

12. The test is about to begin. Please put___out____all of your books and notebooks

13. 'How do you spell this word?' ' i'm not sure. You'd better louk it____up___in your dictionary

20 tháng 10 2018

VIII. Fill in the blank with one suitable preposition or adverb. have a cup of tea.

1. You look tired. Sit_____down____and have a cup of tea

2. I'm looking____for___ yesterday's newspaper. Did you throw it ___away____?

3. Could I try_____on____these shoes, please? Size nine.

4. Turn __down____the music. It's too loud!

5. Don't forget to turn_____off_____ the lights when you come to bed.

6. I used to smoke, but I gave__up____last year.

7. Just carry____out____with what you were doing

8. Pick ___up____ your litter! Don't drop it on the street!

9. Don't worry about the baby. I'll look_____after___her while you're out.

10. I'm looking____forward____ to meeting her very much.

1. John did most of the work. He is very clever. III. RELATIVE CLAUSES WITH PREPOSITIONS: 1. Here's the address. You should write to this address. 2. Renewable energy sources are difficult topics. I'm not familiar with these topics. 3. This country now has 300 wind turbines. The national network relies on these turbines. 4. The radio is made in China. You are listening to it . 5. Your mother is very nice. I talked to her last week. 6. These are my friends. I went to Da Lat with them last...
Đọc tiếp

1. John did most of the work. He is very clever.

III. RELATIVE CLAUSES WITH PREPOSITIONS:

1. Here's the address. You should write to this address.

2. Renewable energy sources are difficult topics. I'm not familiar with these topics.

3. This country now has 300 wind turbines. The national network relies on these turbines.

4. The radio is made in China. You are listening to it .

5. Your mother is very nice. I talked to her last week.

6. These are my friends. I went to Da Lat with them last year.

7. I will hold a party. You will be invited to it.

8. I don't like my girlfriend. She always asks me to wait for her whenever we go out.

9. These are the books. I have told you about them.

10. That is the man. I 've borrowed some money from him.

11. Who was that man? I saw you with that man in the restaurant.

12. The wall is dirty. You are leaning against it.

13. I'm going to visit Brazil. I don't know anything at all about it.

14. My uncle Tom will be arriving tomorrow. You've heard so much about him.

15. A history of the town will be published soon. People know nothing about it.

16. She found the bag. It belonged to her.

17. This is the guy. I got it from him.

18. You are the partner. I want to work with you.

19. Here is the museum. I told you about it.

1
17 tháng 9 2017

1. John did most of the work. He is very clever.

-> John, who is very clever, did most of the work.

III. RELATIVE CLAUSES WITH PREPOSITIONS:

1. Here's the address. You should write to this address.

-> Here's the address to which you should write.

2. Renewable energy sources are difficult topics. I'm not familiar with these topics.

-> Renewable energy sources, which topics I'm not familiar with, are difficult topics.

3. This country now has 300 wind turbines. The national network relies on these turbines.

-> This country now has 300 wind turbines which the national network relies on.

4. The radio is made in China. You are listening to it .

-> The radio, which you are listening to, is made in China.

5. Your mother is very nice. I talked to her last week.

-> Your mother, to whom I talked last week, is very nice.

6. These are my friends. I went to Da Lat with them last year.

-> These are my friends with whom I went to Da Lat last year.

7. I will hold a party. You will be invited to it.

-> I will hold a party which you will be invited to.

8. I don't like my girlfriend. She always asks me to wait for her whenever we go out.

-> I don't like my girlfriend who always asks me to wait for her whenever we go out.

9. These are the books. I have told you about them.

-> These are the books which I have told you about.

10. That is the man. I 've borrowed some money from him.

-> That is the man whom I've borrowed some money from.

11. Who was that man? I saw you with that man in the restaurant.

-> Who was that man, with whom I saw you in the restaurant?

12. The wall is dirty. You are leaning against it.

-> The wall, which you are leaning against, is dirty.

13. I'm going to visit Brazil. I don't know anything at all about it.

-> I'm going to visit Brazil which I don't know anything at all about.

14. My uncle Tom will be arriving tomorrow. You've heard so much about him.

-> My uncle Tom, whom you've heard so much about, will be arriving tomorrow.

15. A history of the town will be published soon. People know nothing about it.

-> A history of the town, which people know nothing about, will be published soon.

16. She found the bag. It belonged to her.

-> She found the bag which belonged to her.

17. This is the guy. I got it from him.

-> This is the guy whom I got it from.

18. You are the partner. I want to work with you.

-> You are the partner whom I want to work with.

19. Here is the museum. I told you about it.

-> Here is the museum which I told you about.

Tìm lỗi sai và sửa: It was a great to see you again after so long and to be able to discuss about all the things we used to do when we were students together learning the English in London. I hope you had a good journey home . Did the flight reach to Athens in time for you to get up your connection ? I hope so. Do you remember I promised to send you that a book we talked about ? Well, I've searched in everywhere for it but so far I haven't managed to find it . As soon as I will do , I'll...
Đọc tiếp

Tìm lỗi sai và sửa:
It was a great to see you again after so long and to be able to discuss about all the things we used to do when we were students together learning the English in London. I hope you had a good journey home . Did the flight reach to Athens in time for you to get up your connection ? I hope so. Do you remember I promised to send you that a book we talked about ? Well, I've searched in everywhere for it but so far I haven't managed to find it . As soon as I will do , I'll put it in the post to for you - it's a really exciting story . And now I'd like to ask you about a favor , not for me but for my sister . She wants to have work in Greece . She doesn't mind what she does - she would be too happy to work in a bar to look after children . So if only you khow of anything , please let us know . She'd like to spend until one year there from next January , which it should be possible.I think. She has been decided it is the best thing for her . I', looking forward to know hearing from you soon . Give my regards to your family
Best wishes , Costars
1........... 2.................. 3........... 4........... 5............ 6............. 7 .......... 8.............. 9.............. 10................. 11.................. 12............. 13................. 14.................. 15........... 16.................. 17...........

1
13 tháng 6 2019

có vẻ đề không phải sửa lỗi sai mà là tìm từ thừa, ấn đây xem đáp án, vừa làm xong

Underline odd words in the following paragraph. It was a great to see you again after so long and to be able to discuss about all the things we used to do when we were students together learning english in London. I hope you and had a good time journey home. Did the flight reach to Athens in time for you to get up your connection? I hope so. Do you remember I promised to send you that a book we talked about? Well, I've searched in everywhere for it but so far I haven't managed to find it. As...
Đọc tiếp

Underline odd words in the following paragraph.

It was a great to see you again after so long and to be able to discuss about all the things we used to do when we were students together learning english in London. I hope you and had a good time journey home. Did the flight reach to Athens in time for you to get up your connection? I hope so. Do you remember I promised to send you that a book we talked about? Well, I've searched in everywhere for it but so far I haven't managed to find it. As soon as I will do, I'll put it in the post to for you - it's a really exciting story. And now I'd like to ask you about a favor, ont for me but for mys sister. She wants to have a work in Greece. She doesn't mind what she does- she would be to happy to work in a bar or to look after children. So if only you know of anything, please let us know. She'd like to spend until one year there from next January, which it should be possible. I think. She has been decided it is the best thing for her. I'm looking forward to know hearing from you soon. Give my regards to your family.

Best wishes, Costars

3
13 tháng 6 2019

Underline odd words in the following paragraph.

It was a great to see you again after so long and to be able to discuss about all the things we used to do when we were students together learning english in London. I hope you had a good time journey home. Did the flight reach to Athens in time for you to get up your connection? I hope so. Do you remember I promised to send you that a book we talked about? Well, I've searched in everywhere for it but so far I haven't managed to find it. As soon as I will do, I'll put it in the post to for you - it's a really exciting story. And now I'd like to ask you about a favor, ont for me but for mys sister. She wants to have a work in Greece. She doesn't mind what she does- she would be to happy to work in a bar or to look after children. So if only you know of anything, please let us know. She'd like to spend until one year there from next January, which it should be possible. I think. She has been decided it is the best thing for her. I'm looking forward to know hearing from you soon. Give my regards to your family.

Best wishes, Costars

13 tháng 6 2019

Tổng có 17 từ thừa

Complete each blank with a suitable Preposition: 1) He speaks English like a native. He can give us advice ... how to improve our pronunciation. 2) Hoa often helps Na ... her written assignments. 3) Why don't you work harder ... the project? We have only two days left to complete it. 4) The TV repairman will be here ... five minutes. 5) People throughout the world must work together to look ... the environment. 6) If you go ... leaving the lights on all day, you will have an enormous...
Đọc tiếp

Complete each blank with a suitable Preposition:

1) He speaks English like a native. He can give us advice ... how to improve our pronunciation.

2) Hoa often helps Na ... her written assignments.

3) Why don't you work harder ... the project? We have only two days left to complete it.

4) The TV repairman will be here ... five minutes.

5) People throughout the world must work together to look ... the environment.

6) If you go ... leaving the lights on all day, you will have an enormous electricity bill to pay ... the end of this month.

7) Have you seen my little sister? I've been looking ... her ... two hours.

8) Travelling ... public transport will reduce the amount of exhaust fume from cars and motorbikes.

9) I spend $16 a month ... fares and I have to pay $32 ... lighting.

10) What is the purpose ... visit ... our country?

11) We are interested ... the shortage of fresh water ... the world's population.

12) The cost of living in Vietnam is low compared ... Singapore.

13) Did children account ... 45 percent of the total population affected by the tsunami?

14) This toilet roll is finished. It should be replaced ... a new one.

15) The head of the household should tell each family member to be aware ... saving energy.

16) Instead ... buying energy-saving lights, we should concentrate ... a more economical use of electricity.

17) He is good ... fixing wooden objects, but he is bad ... building with bricks.

18) This electrical appliance will not work ... electricity.

19) Look ... this enormous telephone bill before leaving ... work, darling. I can't believe in my eyes.

20) If you've got a cough, you should try to cut ... the number of cigarettes you smoke.

1
26 tháng 2 2019

Complete each blank with a suitable Preposition:

1) He speaks English like a native. He can give us advice ..on. how to improve our pronunciation.

2) Hoa often helps Na .with.. her written assignments.

3) Why don't you work harder ..for. the project? We have only two days left to complete it.

4) The TV repairman will be here .in.. five minutes.

5) People throughout the world must work together to look ..after. the environment.

6) If you go ..on. leaving the lights on all day, you will have an enormous electricity bill to pay ..at. the end of this month.

7) Have you seen my little sister? I've been looking ..for. her .for.. two hours.

8) Travelling ..by. public transport will reduce the amount of exhaust fume from cars and motorbikes.

9) I spend 16amonth..on.faresandIhavetopay16amonth..for.faresandIhavetopay32 .for.. lighting.

10) What is the purpose .of your.. visit .to.. our country?

11) We are interested ..in. the shortage of fresh water .to.. the world's population.

12) The cost of living in Vietnam is low compared .to.. Singapore.

13) Did children account .for.. 45 percent of the total population affected by the tsunami?

14) This toilet roll is finished. It should be replaced .with.. a new one.

15) The head of the household should tell each family member to be aware ..of. saving energy.

16) Instead ...of buying energy-saving lights, we should concentrate ..on. a more economical use of electricity.

17) He is good ..at. fixing wooden objects, but he is bad .at.. building with bricks.

18) This electrical appliance will not work .on.. electricity.

19) Look ..at. this enormous telephone bill before leaving ..for. work, darling. I can't believe in my eyes.

20) If you've got a cough, you should try to cut .down on.. the number of cigarettes you smoke.