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III. Choose the best answer (a,b,c,d) to complete the following sentences.(2ms)

1.                  His daughter wants to become a well known …………but she has no talent at all. 

A.                 act

B.                 actor

C.                 actress

D.                 action

2.                  Mozart was one of the most famous ……….....of classical music.

A.                 actors

B.                 composers

C.                 actists

D.                 makers

3.                  Look!The trees and flowers ………care of by the gadeners of the Temple Literature.

A.                 Are being taken

B.                 Is taken

C.                 taken

D.                 were taken

4.                  My father…………………the Head master of ChuVan An Secondary School

A.choose

    B. is chosen

    C.are chosen

D. chose

5.                  A new University …….....in my town in the near future.

A.                 is built

B.will be built

B.was built

B.                 has been built

6.                  He bought…………books and then left for home.

A.much more

B. a few

C.a lot

D. a little

   7. ……….....! Can you tell me the way to the food shop?

   A. Thank you                B. All right                          C.Listen                          D.Excuse me

   8.  I don’t often go to school by bus because it ………a lot of time.

   A.spends                           B. has                        C.takes                                  D. gets

2
8 tháng 12 2021

1.                  His daughter wants to become a well known …………but she has no talent at all. 

A.                 act

B.                 actor

C.                 actress

D.                 action

2.                  Mozart was one of the most famous ……….....of classical music.

A.                 actors

B.                 composers

C.                 actists

D.                 makers

3.                  Look!The trees and flowers ………care of by the gadeners of the Temple Literature.

A.                 Are being taken

B.                 Is taken

C.                 taken

D.                 were taken

4.                  My father…………………the Head master of ChuVan An Secondary School

A.choose

    B. is chosen

    C.are chosen

D. chose

5.                  A new University …….....in my town in the near future.

A.                 is built

B.will be built

B.was built

B.                 has been built

6.                  He bought…………books and then left for home.

A.much more

B. a few

C.a lot

D. a little

   7. ……….....! Can you tell me the way to the food shop?

   A. Thank you                B. All right                          C.Listen                          D.Excuse me

   8.  I don’t often go to school by bus because it ………a lot of time.

 

   A.spends                           B. has                        C.takes                                  D. gets

8 tháng 12 2021

1.C                         

2.B

3.A

4.B

5.B

6.B

7.B

8.D

9.C

III. Circle the best answer to complete each sentence: (3)     1. I didn’t stay at home last Sunday and ________ did my younger brother.A. tooB. eitherC. neitherD. so2. Do you like comics? - ________.A. Yes, I’d love toB. Yes, a lotC. I like itD. Sure, I’ll go3. We can learn more about the undersea world ________ Jacques Cousteau’s invention.A. thanking toB. thank toC. thanks toD. thanked to4. I ________ finish my homework so I decide ________ table tennis this afternoon.A. ought ...
Đọc tiếp

III. Circle the best answer to complete each sentence: (3)    

1. I didn’t stay at home last Sunday and ________ did my younger brother.

A. too

B. either

C. neither

D. so

2. Do you like comics? - ________.

A. Yes, I’d love to

B. Yes, a lot

C. I like it

D. Sure, I’ll go

3. We can learn more about the undersea world ________ Jacques Cousteau’s invention.

A. thanking to

B. thank to

C. thanks to

D. thanked to

4. I ________ finish my homework so I decide ________ table tennis this afternoon.

A. ought  / play

B. ought to /not  to play

C. should / play

D. should / not play

5. Hoa gets used to ________ in the busy roads in Hanoi.

A. cycle

B. cycles

C. cycled

D. cycling

6. Would you like to go __________a sightseeing?

A. with

B. on

C. for

D. in

7. Can we get something to eat ________ train?

A. in

B. by

C. in the

D. at the

8. Our teachers asked John to do homework _______.

A. himself

B. themselves

C. itself

D. ourselves

9. Did he tell you how much _______?

A. the book costs

B. does the book cost

C. did the book cost

D. the book cost

10. When I was young I never smoked and _________ my brother.

A. neither does 

B. neither did

C. so does

D. so did

11. He worked very ______ so he got good grades last semester.

A. hardly

B. hard

C. lazy

D. lazily 

12. Next week when there _______ a full moon, the ocean tides will be higher.

A. is being

B. is

C. will be

D. was

13. When getting on the bed, we had better take ______________.your shoes.

     A. on                           B. off                                  C. out                                 D. of

14. Living in the country is not expensive. And it isn’t complex___________

     A. either                      B. too                                C. neither                         D. so

15. I still feel like a cigarette although I ___________smoking twenty years ago.

     A. give in                     B. gave over                     C. gave up                       D. gave away

5
6 tháng 8 2020

1.D

2.A

3.B

4.B

5.D

6.C

7.B

8.A

9.A

10.B

11.B

12.B

13.B

14.B

15.C

6 tháng 8 2020

1d ; 2a ; 3b ; 4b ; 5a ; 6c ; 7c ; 8a ; 9b ; 10d ; 11b ; 12c ; 13b ; 14b ; 15c

20 tháng 8 2023

Activities you do for … (Những hoạt động cho dành cho...)

yourself (bản thân em)

your community (cộng đồng của em)

- cleaning your room (dọn dẹp phòng của bạn)

- collecting stamp (sưu tập tem)

- doing judo (tập judo)

- doing sport (tập thể thao)

- raising money for charity (quyên góp tiền cho tổ chức từ thiện)

- doing volunteer work (làm công việc tình nguyện)

- helping street children (giúp đỡ trẻ em đường phố)

- donating clothes (quyên góp quần áo)

II.Circle the best option (A, B, C or D) to complete the sentences below. (4points)1. How far ………….it from Ha Noi to Ho Chi Minh City?A. isB. areC. doD. does2. Ba is in his room. He ……….. the guitar now.A.  playingB.  playsC. is playingD. will play3. Every day Mr. Tuan ………….. in the fields from 6 am  till  4 pm.A. workingB. workC. is workingD. works4. In the future, machines ………… all the work for us.A. are doingB. will doC. were doingD. do5. Next month is...
Đọc tiếp

II.Circle the best option (A, B, C or D) to complete the sentences below. (4points)

1. How far ………….it from Ha Noi to Ho Chi Minh City?

A. is

B. are

C. do

D. does

2. Ba is in his room. He ……….. the guitar now.

A.  playing

B.  plays

C. is playing

D. will play

3. Every day Mr. Tuan ………….. in the fields from 6 am  till  4 pm.

A. working

B. work

C. is working

D. works

4. In the future, machines ………… all the work for us.

A. are doing

B. will do

C. were doing

D. do

5. Next month is Mai’s 15th birthday. She …………some of her friends to her birthday  party .

A. invite

B. invites

C. is going to invite

D. to  invite

6. We will ……………our old friend next Sunday.

A. to meet

B. meeting

C. meet

D.meets

7. Her birthday is ……………Friday, August 20th

A. at

B. in

C. on

D.for

8. This dress is the …………..expensive of the four dresses

A. best

B. more

C. most

D.much

9. My father take care …………….sick children.

A. of

B. about

C. in

D.with

10. Would you like …………the movie with me?

A. see

B. to see

C. seeing

D.sees

2
21 tháng 10 2018

1. A

2. C

3. D

4. B

5. C

6. C

7. C

8. C

9. A

10. B

21 tháng 10 2018

1.A

2.C

3.D

4.B

5.C

6.C

7.C

8.C

9.A

10.B

Học tốt!

6 tháng 3 2017

1/ B

2/ E

3/ F

4/ C

5/ D

6/ A

Study Well !

16 tháng 4 2017

b)the roads are noisy and busy

c)the noise is from every direction

d)the neighbors are keep people awake at night

e)cars,motorbikes,bikes are too many

f)eating out is expensive

29 tháng 3 2017

Complete sentences about TV in Viet Nam many years ago.Use the words in the box.

black went popular through
white gathered very until
inside few very outside
closed had

a)Many years ago......very........ ..........few......... people...had............ a TV set.

b)The owners of TVs were......very...... ...popular.............. .

c)There were only ...........black........ and .......white............ TV programs.

d)The neighbors..........gathered............. both ...........inside........... and ..............outside........ the TV owner's house.They watched.......through............. the window.

e)No one.......went.......... home.........until.......... th TV station.......closed......... for the night.

29 tháng 3 2017

a)Many years ago very few people had a TV set.

b)The owners of TVs were very popular .

c)There were only black and white TV programs.

d)The neighbors gathered both inside and outside the TV owner's house.They watched through the window.

e)No one went home until the TV station closed for the night.

III. Choose the best answer to complete the sentences below. (4ms) 11. John is looking ..........an apartment in Hanoi for his family. 12. Nam charecter is different.......his father. A . from B . with C . to D . in 13. Remember often to .......... ..in touch with me. A . lose B . keep C . make D . take 14. My friend can play the violin...
Đọc tiếp

III. Choose the best answer to complete the sentences below. (4ms)

11. John is looking ..........an apartment in Hanoi for his family.

12. Nam charecter is different.......his father.

A . from

B . with

C . to

D . in

13. Remember often to .......... ..in touch with me.

A . lose

B . keep

C . make

D . take

14. My friend can play the violin very......... .

A . good

B . well

C . excellent

D . nice

15. American students often .......... in different activities at recess.

A . talk

B . do

C . take part

D . play

16. Some people are used to..... in crowed buses, and don't mind it at all

A . riding

B . ride

C . rode

D . rides

17. He practices .........English everyday with his friends

A . to speak

B . speaking

C . speak

D . speaks

18. His sister prefers detective stories .......... science fictions

A . than

B . to

C . from

D . as

19. Hoa looked very .........when I told her the news.

A . happy

B . happily

C . unhappy

D . hapiness

20. It is fun to cam in the forest, but It is very important to know how to ........nature clean before we leave.

A . give

B . get

C . keep

D . take

21. You should be careful when playing games, Video games can be .............

A . addicting

B . addictive

C . addiction

D . addicted

22. Some games player spend too much time............the computer games

A . on

B . in

C . at

D . about

23. My parents like fish, but ..............

A .so do I

B . neither do I

C . I do too

D . I don't

24. My sister has a.............summer vacation.

A . five - weeks

B . five - week's

C . five - weeks'

D . five - week

25. Of the two girls, Nga is................

A . beautiful

B . more beautiful

C . the more beautiful

D . the most beautiful

26. My classmate, Oanh, likes collecting things. She has a good .......of coins.

A . collector

B . collect

C . collection

D . collective

27. If he eats all that food, he eats ................

A . quite much

B . too many

C . quite many

D . too much

28. There are two restaurant in the town and ........of them are extremely old.

A . each

B . all

C . both

D . most

29. My funny story made the whole class.............

A . smile

B . laughing

C . laugh

D . crying

30. She needed……......these postcards to her friends

A . to send

B . sending

C . sent

D . send

1
15 tháng 3 2020

III. Choose the best answer to complete the sentences below. (4ms)

11. John is looking .....for.....an apartment in Hanoi for his family.

12. Nam charecter is different.......his father.

A . from

B . with

C . to

D . in

13. Remember often to .......... ..in touch with me.

A . lose

B .keep

C . make

D . take

14. My friend can play the violin very......... .

A . good

B . well

C . excellent

D . nice

15. American students often .......... in different activities at recess.

A . talk

B . do

C . take part

D . play

16. Some people are used to..... in crowed buses, and don't mind it at all

A . riding

B . ride

C . rode

D . rides

17. He practices .........English everyday with his friends

A . to speak

B . speaking

C . speak

D . speaks

18. His sister prefers detective stories .......... science fictions

A . than

B . to

C . from

D . as

19. Hoa looked very .........when I told her the news.( Mình thấy cả hai câu này đều đúng nên mình in đậm cả đáp án A và C nhé. Thứ nhất là vì đúng cấu trúc và thứ hai đều là tính từ)

A . happy

B . happily

C . unhappy

D . hapiness

20. It is fun to cam in the forest, but It is very important to know how to ........nature clean before we leave.

A . give

B . get

C . keep

D . take

21. You should be careful when playing games, Video games can be .............

A . addicting

B . addictive

C . addiction

D.addicted

22. Some games player spend too much time............the computer games

A . on

B . in

C . at

D . about

23. My parents like fish, but ..............

A .so do I

B . neither do I

C . I do too

D . I don't

24. My sister has a.............summer vacation.

A . five - weeks

B . five - week's

C . five - weeks'

D . five - week

25. Of the two girls, Nga is................

A . beautiful

B . more beautiful

C.themore beautiful

D . the most beautiful

26. My classmate, Oanh, likes collecting things. She has a good .......of coins.

A . collector

B . collect

C . collection

D . collective

27. If he eats all that food, he eats ................

A . quite much

B . too many

C . quite many

D . too much

28. There are two restaurant in the town and ........of them are extremely old.

A . each

B . all

C .both

D . most

29. My funny story made the whole class.............

A . smile

B . laughing

C . laugh

D . crying

30. She needed……......these postcards to her friends

A . to send

B . sending

C . sent

D . send

Chúc học tốt nhé bạn A.R.M.Yyeu

1. I bought this dress at the ____________ on Hang Bai street. A. clothes’store B. store of closes C. clothes store D. clothing store 2. When they ____________ children, they often played with together. A. was B. will C. are D. were 3. Isn’t it easy to learn English well ? . ...
Đọc tiếp

1. I bought this dress at the ____________ on Hang Bai street.

A. clothes’store

B. store of closes

C. clothes store

D. clothing store

2. When they ____________ children, they often played with together.

A. was

B. will

C. are

D. were

3. Isn’t it easy to learn English well ? .

A. No, it is.

B. No, it does not.

C. Yes, it is.

D. Yes, it does.

4. There are two churches in the town and ____________ of them are extremely old.

A. each

B. all

C. both

D. most

5. Jane and Jack stood in front of the mirror and looked at_____________.

A. herself

B. himself

C. themselves

D. ourselves

6.Which one is ____________ milk or orange juice?

A. better

B. the best

C. good

D. well

7. The news on TV last night ____________ very good.

A. was

B. has

C. were

D. be

8. The smaller the room is, the __________furniture it needs.

A. fewer

B. smaller

C. less

D. more

9. ______________ from seeing beautiful sites , visitors enjoy traditional food.

A. According to

B. Apart

C. Together

D. As well as

10. Thanks for giving me good advice.

A. Thank you.

C. What about going to the movies?

B. You’re welcome.

D. I’d love to. What time?

11. His English is better than ___________.

A. me

B. my

C. I

D. mine

12 . “ Nhi doesn’t like American beer” – “ ___________does Vy”.

A. Either

B. So

C. Neither

D. Too

13.He ___________be tired after all that hard work. I’m sure about that.

A. may

B. can

C. must

D. certainly

14. . Mr Robinson speaks Vietnamese very __________.

A. skillfully

B. good

C. fluently

D. best

15. Tim wants to hear about ___________.

A. how students in Viet Nam live.

C. how do students in Viet Nam live?

B. how students in Viet Nam live?

D. how do students in Viet Nam

4
8 tháng 7 2017

1. I bought this dress at the ____________ on Hang Bai street.

A. clothes’store

B. store of closes

C. clothes store

D. clothing store

2. When they ____________ children, they often played with together.

A. was

B. will

C. are

D. were

3. Isn’t it easy to learn English well ? .

A. No, it is.

B. No, it does not.

C. Yes, it is.

D. Yes, it does.

4. There are two churches in the town and ____________ of them are extremely old.

A. each

B. all

C. both

D. most

5. Jane and Jack stood in front of the mirror and looked at_____________.

A. herself

B. himself

C. themselves

D. ourselves

6.Which one is ____________ milk or orange juice?

A. better

B. the best

C. good

D. well

7. The news on TV last night ____________ very good.

A. was

B. has

C. were

D. be

8. The smaller the room is, the __________furniture it needs.

A. fewer

B. smaller

C. less

D. more

9. ______________ from seeing beautiful sites , visitors enjoy traditional food.

A. According to

B. Apart

C. Together

D. As well as

10. Thanks for giving me good advice.

A. Thank you.

C. What about going to the movies?

B. You’re welcome.

D. I’d love to. What time?

11. His English is better than ___________.

A. me

B. my

C. I

D. mine

12 . “ Nhi doesn’t like American beer” – “ ___________does Vy”.

A. Either

B. So

C. Neither

D. Too

13.He ___________be tired after all that hard work. I’m sure about that.

A. may

B. can

C. must

D. certainly

14. . Mr Robinson speaks Vietnamese very __________.

A. skillfully

B. good

C. fluently

D. best

15. Tim wants to hear about ___________.

A. how students in Viet Nam live.

C. how do students in Viet Nam live?

B. how students in Viet Nam live?

D. how do students in Viet Nam

8 tháng 7 2017

1. I bought this dress at the ____________ on Hang Bai street.

A. clothes’store

B. store of closes

C. clothes store

D. clothing store

2. When they ____________ children, they often played with together.

A. was

B. will

C. are

D. were

3. Isn’t it easy to learn English well ? .

A. No, it is.

B. No, it does not.

C. Yes, it is.

D. Yes, it does.

4. There are two churches in the town and ____________ of them are extremely old.

A. each

B. all

C. both

D. most

5. Jane and Jack stood in front of the mirror and looked at_____________.

A. herself

B. himself

C. themselves

D. ourselves

6.Which one is ____________ milk or orange juice?

A. better

B. the best

C. good

D. well

7. The news on TV last night ____________ very good.

A. was

B. has

C. were

D. be

8. The smaller the room is, the __________furniture it needs.

A. fewer

B. smaller

C. less

D. more

9. ______________ from seeing beautiful sites , visitors enjoy traditional food.

A. According to

B. Apart

C. Together

D. As well as

10. Thanks for giving me good advice.

A. Thank you.

C. What about going to the movies?

B. You’re welcome.

D. I’d love to. What time?

11. His English is better than ___________.

A. me

B. my

C. I

D. mine

12 . “ Nhi doesn’t like American beer” – “ ___________does Vy”.

A. Either

B. So

C. Neither

D. Too

13.He ___________be tired after all that hard work. I’m sure about that.

A. may

B. can

C. must

D. certainly

14. . Mr Robinson speaks Vietnamese very __________.

A. skillfully

B. good

C. fluently

D. best

15. Tim wants to hear about ___________.

A. how students in Viet Nam live.

C. how do students in Viet Nam live?

B. how students in Viet Nam live?

D. how do students in Viet Nam

Choose the letter (A, B, C, or D) as the best answer to complete the following sentences. 1. Minh never goes to school late and____________. A. I do, too B. I don't, too C. Neither do I D. I do, either 2. I often have breakfast _________some bread and a glass of milk. A. with B. for C. by D. of 3. Of the two boys, Peter is_____________. A. the tallest B....
Đọc tiếp

Choose the letter (A, B, C, or D) as the best answer to complete the following sentences.

1. Minh never goes to school late and____________.

A. I do, too

B. I don't, too

C. Neither do I

D. I do, either

2. I often have breakfast _________some bread and a glass of milk.

A. with

B. for

C. by

D. of

3. Of the two boys, Peter is_____________.

A. the tallest

B. the taller

C. tall

D. more skillfully

4. This man usually borrows money__________his friends.

A. of

B. to

C. from

D. for

5. ~ Would you like to go to the movies with us? ~ ___________.

A. I wouldn't

B. I like it very much

C. Thank you

D. I'd love to

6. Would you please__________me how to play the piano?

A. show

B. showed

C. showing

D. to show

7. The nurse will__________ your temperature soon.

A. weigh

B. measure

C. take

D. hear

8. ~ What do you think about this book? ~ I find it very _________.

A. bore

B. boring

C. bored

D. boringly

9. ~ Why don't we have a party this weekend? ~ __________.

A. Good idea

B. Yes, let's

C. That would be great fun

D. All are correct

10. I didn't see the end of the film because I ______ asleep.

A. felt

B. went

C. felled

D. fell

11. Hoa prefers colorful dances in Thailand ______ puppet shows in Indonesia.

A. than

B. to

C. better than

D. more than

12. Hoa ________on the new dress but it didn't fit her.

A. put

B. took

C. tried

D. turned

13. ________ to meet you, Mary.

A. pleased

B. please

C. pleasure

D. pleasant

14. Today Mr. Ha feels_________ better than yesterday.

A. many

B. too

C. so

D. much

15. Farmers have to work_________ all day and night long.

A. hardly

B. hard

C. more hard

D. hardily

16. __________coffee with milk is mine.

A. An

B. A

C. The

D. Ø

17. Wait for me at the school gate,__________?

A. do you

B. will you

C. don't you

D. didn't you

18. Be careful with your book __________ it will fall.

A. if

B. and

C. but

D. or

19. Air__________ is one of the most serious problems nowadays.

A. pollution

B. pollute

C. polluted

D. polluting

20. Mrs Hoa has two children but _________of them is at home now.

A. all

B. both

C. most

D. neither

2
26 tháng 3 2017

Choose the letter (A, B, C, or D) as the best answer to complete the following sentences.

1. Minh never goes to school late and____________.

A. I do, too

B. I don't, too

C. Neither do I

D. I do, either

2. I often have breakfast _________some bread and a glass of milk.

A. with

B. for

C. by

D. of

3. Of the two boys, Peter is_____________.

A. the tallest

B. the taller

C. tall

D. more skillfully

4. This man usually borrows money__________his friends.

A. of

B. to

C. from

D. for

5. ~ Would you like to go to the movies with us? ~ ___________.

A. I wouldn't

B. I like it very much

C. Thank you

D. I'd love to

6. Would you please__________me how to play the piano?

A. show

B. showed

C. showing

D. to show

7. The nurse will__________ your temperature soon.

A. weigh

B. measure

C. take

D. hear

8. ~ What do you think about this book? ~ I find it very _________.

A. bore

B. boring

C. bored

D. boringly

9. ~ Why don't we have a party this weekend? ~ __________.

A. Good idea

B. Yes, let's

C. That would be great fun

D. All are correct

10. I didn't see the end of the film because I ______ asleep.

A. felt

B. went

C. felled

D. fell

11. Hoa prefers colorful dances in Thailand ______ puppet shows in Indonesia.

A. than

B. to

C. better than

D. more than

12. Hoa ________on the new dress but it didn't fit her.

A. put

B. took

C. tried

D. turned

13. ________ to meet you, Mary.

A. pleased

B. please

C. pleasure

D. pleasant

14. Today Mr. Ha feels_________ better than yesterday.

A. many

B. too

C. so

D. much

15. Farmers have to work_________ all day and night long.

A. hardly

B. hard

C. more hard

D. hardily

16. __________coffee with milk is mine.

A. An

B. A

C. The

D. Ø

17. Wait for me at the school gate,__________?

A. do you

B. will you

C. don't you

D. didn't you

18. Be careful with your book __________ it will fall.

A. if

B. and

C. but

D. or

19. Air__________ is one of the most serious problems nowadays.

A. pollution

B. pollute

C. polluted

D. polluting

20. Mrs Hoa has two children but _________of them is at home now.

A. all

B. both

C. most

D. neither

26 tháng 3 2017

Choose the letter (A, B, C, or D) as the best answer to complete the following sentences.

1. Minh never goes to school late and____________.

A. I do, too

B. I don't, too

C. Neither do I

D. I do, either

2. I often have breakfast _________some bread and a glass of milk.

A. with

B. for

C. by

D. of

3. Of the two boys, Peter is_____________.

A. the tallest

B. the taller

C. tall

D. more skillfully

4. This man usually borrows money__________his friends.

A. of

B. to

C. from

D. for

5. ~ Would you like to go to the movies with us? ~ ___________.

A. I wouldn't

B. I like it very much

C. Thank you

D. I'd love to

6. Would you please__________me how to play the piano?

A. show

B. showed

C. showing

D. to show

7. The nurse will__________ your temperature soon.

A. weigh

B. measure

C. take

D. hear

8. ~ What do you think about this book? ~ I find it very _________.

A. bore

B. boring

C. bored

D. boringly

9. ~ Why don't we have a party this weekend? ~ __________.

A. Good idea

B. Yes, let's

C. That would be great fun

D. All are correct

10. I didn't see the end of the film because I ______ asleep.

A. felt

B. went

C. felled

D. fell

11. Hoa prefers colorful dances in Thailand ______ puppet shows in Indonesia.

A. than

B. to

C. better than

D. more than

12. Hoa ________on the new dress but it didn't fit her.

A. put

B. took

C. tried

D. turned

13. ________ to meet you, Mary.

A. pleased

B. please

C. pleasure

D. pleasant

14. Today Mr. Ha feels_________ better than yesterday.

A. many

B. too

C. so

D. much

15. Farmers have to work_________ all day and night long.

A. hardly

B. hard

C. more hard

D. hardily

16. __________coffee with milk is mine.

A. An

B. A

C. The

D. Ø

17. Wait for me at the school gate,__________?

A. do you

B. will you

C. don't you

D. didn't you

18. Be careful with your book __________ it will fall.

A. if

B. and

C. but

D. or

19. Air__________ is one of the most serious problems nowadays.

A. pollution

B. pollute

C. polluted

D. polluting

20. Mrs Hoa has two children but _________of them is at home now.

A. all

B. both

C. most

D. neither