K
Khách

Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.

19 tháng 4 2019

B might

mình làm chưa chắc đúng

hok tốt

19 tháng 4 2019

Hoa was worried that we ............. miss the train

A) can            B)might             C)would              D)will

16 tháng 4 2017

1.Her father began to smoke when his wife died.

->Her father has to smoked since his wife died.

2,My son started collecting used stamps five years ago.

->My son has collected used stamps since five years.

3,Hoa was worried that we might miss the train.

28 tháng 3 2018

choose the correct answer A,B,C or D to finish the sentence

4.do you think he__the match?

a,will win b,wins c,is winning d,has won

5,A:your apastment is so neat! are you expexting guests?

B:yes. My uncle and aunt__tomorrow for two day visit

a,will arive b,arrived c, are arriving d,have arrived

6.the clouds are leaving, and the sun is coming out. It probably__anymore

a,is rainning b,isn't rainning c,will rain d,won't rain

7,A:I wonder if he'll get the job

B:he__, but I don't think so

a,might b,must c,ought d,would

8,You__ be come before dark because it is dangerous to walk home alone at night

a,might b,may c.ought d,must

9.It is rainning.__I close the window

a, would b, might c, should d, ought

10.Hoa was worried the we __ miss the train

a, can b,might c,shall d,will

Choose the best option for each sentences: 1. Laura, you and the kids just have dinner without waiting for me. I......work very hard today. A. Can B. May C. Should D. Would 2. I........ be delighted to show you round the factory. A. Ought to B. Would C. Might D. Can 3. Leave early so that you....... miss the bus. A. Didn’t B. Won’t C. Shouldn’t D. Mustn’t 4. Jenny’s engagement ring is enormous!!’ It....... have cost a fotune A. Must B. Might. C. Will. D. Should 5. You....... to...
Đọc tiếp

Choose the best option for each sentences:

1. Laura, you and the kids just have dinner without waiting for me. I......work very hard today.

A. Can B. May C. Should D. Would

2. I........ be delighted to show you round the factory.

A. Ought to B. Would C. Might D. Can

3. Leave early so that you....... miss the bus.

A. Didn’t B. Won’t C. Shouldn’t D. Mustn’t

4. Jenny’s engagement ring is enormous!!’ It....... have cost a fotune

A. Must B. Might. C. Will. D. Should

5. You....... to write them today

A. Should. B. Must. C. Had D. Ought

6. I hope i......... fin it

A. Will. B. Shall. C. Could. D. Must

7. Unless he runs he...... catch the train

A. Will. B. Mustn’t. C. Wouldn’t. D. Won’t

8. .......... you be in Rome tonight.

A. Will. B. May. C. Might. D. Maybe

9. We....... have time to help you tomorrow.

A. May. B. Must. C. Will D. Could

10. “........ you hand me that pair of scissors, please?”

A. May. B. Will. C. Shall. D. Should

2
30 tháng 7 2018

Choose the best option for each sentences:

1. Laura, you and the kids just have dinner without waiting for me. I......work very hard today.

A. Can B. May C. Should D. Would

2. I........ be delighted to show you round the factory.

A. Ought to B. Would C. Might D. Can

3. Leave early so that you....... miss the bus.

A. Didn’t B. Won’t C. Shouldn’t D. Mustn’t

4. Jenny’s engagement ring is enormous!!’ It....... have cost a fotune

A. Must B. Might. C. Will. D. Should

5. You....... to write them today

A. Should. B. Must. C. Had D. Ought

6. I hope i......... fin it

A. Will. B. Shall. C. Could. D. Must

7. Unless he runs he...... catch the train

A. Will. B. Mustn’t. C. Wouldn’t. D. Won’t

8. .......... you be in Rome tonight.

A. Will. B. May. C. Might. D. Maybe

9. We....... have time to help you tomorrow.

A. May. B. Must. C. Will D. Could

10. “........ you hand me that pair of scissors, please?”

A. May. B. Will. C. Shall. D. Should

30 tháng 7 2018

1. Laura, you and the kids just have dinner without waiting for me. I......work very hard today.

A. Can B. May C. Should D. Would

2. I........ be delighted to show you round the factory.

A. Ought to B. Would C. Might D. Can

3. Leave early so that you....... miss the bus.

A. Didn’t B. Won’t C. Shouldn’t D. Mustn’t

4. Jenny’s engagement ring is enormous!!’ It....... have cost a fotune

A. Must B. Might. C. Will. D. Should

5. You....... to write them today

A. Should. B. Must. C. Had D. Ought

6. I hope i......... fin it

A. Will. B. Shall. C. Could. D. Must

7. Unless he runs he...... catch the train

A. Will. B. Mustn’t. C. Wouldn’t. D. Won’t

8. .......... you be in Rome tonight.

A. Will. B. May. C. Might. D. Maybe

9. We....... have time to help you tomorrow.

A. May. B. Must. C. Will D. Could

10. “........ you hand me that pair of scissors, please?”

A. May. B. Will. C. Shall. D. Should

Bài 1: Choose the best answer ( A, B, C or D) 1. We also watch films _____ smart phones A. in B. at C. on D. to 2. I might have a smart phone _____ the internet A. surf B. to surf C. surfing D. to surfing 3. Do you think we will _____ holiday to the Moon? A. go B. go on C. go on the D. go for 4. Will you have a car _____ can fly into space? A. it B. this C. what D. that 5. We might have robots _____ our meals A. cook B. to cook C. cooking D. to cooking 6. A hi-tech robot will help us...
Đọc tiếp

Bài 1: Choose the best answer ( A, B, C or D)

1. We also watch films _____ smart phones

A. in B. at C. on D. to

2. I might have a smart phone _____ the internet

A. surf B. to surf C. surfing D. to surfing

3. Do you think we will _____ holiday to the Moon?

A. go B. go on C. go on the D. go for

4. Will you have a car _____ can fly into space?

A. it B. this C. what D. that

5. We might have robots _____ our meals

A. cook B. to cook C. cooking D. to cooking

6. A hi-tech robot will help us _____ children while we are away

A. look out B. look at C. look after D. look in

7. I would like to have my house by the _____ so we can see the beach from my window

A. mountains B. city C. sea D. countryside

8. We might have a _____ TV to watch TV programmes from space

A. wireless B. remote C. automatic D. local

9. _____ pencils and paper, every student will have a computer

A. By B. Instead of C. Instead D. At

10. The house will have a super smart TV to send and _____ the emails

A. Post B. Give C. Get D. buy

11. The robot will _____ of the flowers in the garden

A. take care B. take note C. be careful D. carry

12. Super cars will _____ water in the future

A. go by B. run at C. run on D. travel by

13. With a smart watch, you will _____ your friends in other countries

A. speak B. talk C. say D. contact

14. We will have more robots _____ they can help us do housework and protect our houses

A. so B. because C. so that D. although

15. Do you think that our houses will be _____ space?

A. in B. on C. at D. to

16. Our future houses will use _____ energy and they are very friendly to the environment

A. sun B. sunny C. solar D. lunar

17. A super smart TV will help us _____ goods from the supermarket

A. take B. buy C. carry D. order

18. Robots will help us do the housework such as cleaning the floors, _____ meals and so on

A. cook B. cooking C. to cook D. cooked

3
25 tháng 3 2018

Bài 1: Choose the best answer ( A, B, C or D)

1. We also watch films _____ smart phones

A. in B. at C. on D. to

2. I might have a smart phone _____ the internet

A. surf B. to surf C. surfing D. to surfing

3. Do you think we will _____ holiday to the Moon?

A. go B. go on C. go on the D. go for

4. Will you have a car _____ can fly into space?

A. it B. this C. what D. that

5. We might have robots _____ our meals

A. cook B. to cook C. cooking D. to cooking

6. A hi-tech robot will help us _____ children while we are away

A. look out B. look at C. look after D. look in

7. I would like to have my house by the _____ so we can see the beach from my window

A. mountains B. city C. sea D. countryside

8. We might have a _____ TV to watch TV programmes from space

A. wireless B. remote C. automatic D. local

9. _____ pencils and paper, every student will have a computer

A. By B. Instead of C. Instead D. At

10. The house will have a super smart TV to send and _____ the emails

A. Post B. Give C. Get D. buy

11. The robot will _____ of the flowers in the garden

A. take care B. take note C. be careful D. carry

12. Super cars will _____ water in the future

A. go by B. run at C. run on D. travel by

13. With a smart watch, you will _____ your friends in other countries

A. speak B. talk C. say D. contact

14. We will have more robots _____ they can help us do housework and protect our houses

A. so B. because C. so that D. although

15. Do you think that our houses will be _____ space?

A. in B. on C. at D. to

16. Our future houses will use _____ energy and they are very friendly to the environment

A. sun B. sunny C. solar D. lunar

17. A super smart TV will help us _____ goods from the supermarket

A. take B. buy C. carry D. order

18. Robots will help us do the housework such as cleaning the floors, _____ meals and so on

A. cook B. cooking C. to cook D. cooked

( Sửa lại chút vậy)

25 tháng 3 2018

Bài 1: Choose the best answer ( A, B, C or D)

1. We also watch films _____ smart phones

A. in B. at C. on D. to

2. I might have a smart phone _____ the internet

A. surf B. to surf C. surfing D. to surfing

3. Do you think we will _____ holiday to the Moon?

A. go B. go on C. go on the D. go for

4. Will you have a car _____ can fly into space?

A. it B. this C. what D. that

5. We might have robots _____ our meals

A. cook B. to cook C. cooking D. to cooking

6. A hi-tech robot will help us _____ children while we are away

A. look out B. look at C. look after D. look in

7. I would like to have my house by the _____ so we can see the beach from my window

A. mountains B. city C. sea D. countryside

8. We might have a _____ TV to watch TV programmes from space

A. wireless B. remote C. automatic D. local

9. _____ pencils and paper, every student will have a computer

A. By B. Instead of C. Instead D. At

10. The house will have a super smart TV to send and _____ the emails

A. Post B. Give C. Get D. buy

11. The robot will _____ of the flowers in the garden

A. take care B. take note C. be careful D. carry

12. Super cars will _____ water in the future

A. go by B. run at C. run on D. travel by

13. With a smart watch, you will _____ your friends in other countries

A. speak B. talk C. say D. contact

14. We will have more robots _____ they can help us do housework and protect our houses

A. so B. because C. so that D. although

15. Do you think that our houses will be _____ space?

A. in B. on C. at D. to

16. Our future houses will use _____ energy and they are very friendly to the environment

A. sun B. sunny C. solar D. lunar

17. A super smart TV will help us _____ goods from the supermarket

A. take B. buy C. carry D. order

18. Robots will help us do the housework such as cleaning the floors, _____ meals and so on

A. cook B. cooking C. to cook D. cooked

1. Young people ______ obey their parents. a. must c. will b. may d. ought to 2. Laura, you and the kids just have dinner without waiting for me. I ______ work very hard today. a. can c. should b. may d. would 3. I ______ be delighted to show you round the factory. a. ought to c. might b. would d. can 4. Leave early so that you ______ miss the bus. a. didn’t c. shouldn’t b. won’t d. mustn’t 5. Jenny's engagement ring is enormous! It ______ have cost a fortune a. must c. will b. might...
Đọc tiếp

1. Young people ______ obey their parents.
a. must
c. will
b. may
d. ought to
2. Laura, you and the kids just have dinner without waiting for me. I ______ work very hard today.
a. can
c. should
b. may
d. would
3. I ______ be delighted to show you round the factory.
a. ought to
c. might
b. would
d. can
4. Leave early so that you ______ miss the bus.
a. didn’t
c. shouldn’t
b. won’t
d. mustn’t
5. Jenny's engagement ring is enormous! It ______ have cost a fortune
a. must
c. will
b. might
d. should
6. You ______ to write them today.
a. should
c. had
b. must
d.ought
7. I hope I ______ find it.
a. will
c. could
b.shall
d. must
8. Unless he runs he______ catch the train.
a.will
c.wouldn’t
b. mustn’t
d.won’t
9. _____ you be in Rome tonight.
a.will
c.might
b.may
d.maybe
10. We ______ have time to help you tomorrow.
a.may
c.will
b.must
d.could.
11. “______ you hand me that pair of scissors, please?”
a. May
c. Shall
b. Will
d. Should
12. Jeanette did very badly on the exam. She _____ harder.
a.must have studied
c. could have studied
b. should have studied
d. must studied
13. He was very lucky when he fell off the ladder. He _____ himself.
a. could have hurt
c. must have hurt
b. should have hurt
d. will have hurt
14. Marcela didn’t come to class yesterday. She _____ an accident.
a. should have had
c. must have
b. might have
d. may have had
15. John still hasn’t come out. He ______ everything for the trip now.
a. must have been preparing
c. must be preparing
b. will be preparing
d. will have prepared
16. Thomas received a warning for speeding. He _____ so fast.
a. shouldn’t have driven
c. should have
b. would have driven
d. might have driven
17. The photos are black. The X-ray at the airport _____ them.
a. should have damaged
c. would have damaged
c. would damage
d. must have damaged
18. Tom didn’t do his homework, so the teacher became very angry. He _____ his homework.
a. must have done
b. should have done
c. might have
d. will have done
19. My car stopped on the high way. It _____ out of gas
a. may run
c. must be
b. may have run
d. should have run
20. Robert arrived without his book. He _____ it.
a. could have lost
c. would have lost
b. should have lost
d. will have lost

1
10 tháng 4 2017

1. Young people ______ obey their parents.
a. must
c. will
b. may
d. ought to
2. Laura, you and the kids just have dinner without waiting for me. I ______ work very hard today.
a. can
c. should
b. may
d. would
3. I ______ be delighted to show you round the factory.
a. ought to
c. might
b. would
d. can
4. Leave early so that you ______ miss the bus.
a. didn’t
c. shouldn’t
b. won’t
d. mustn’t
5. Jenny's engagement ring is enormous! It ______ have cost a fortune
a. must
c. will
b. might
d. should
6. You ______ to write them today.
a. should
c. had
b. must
d.ought
7. I hope I ______ find it.
a. will
c. could
b. shall
d. must
8. Unless he runs he______ catch the train.
a.will
c.wouldn’t
b. mustn’t
d.won’t
9. _____ you be in Rome tonight.
a. will
c. might
b. may
d. maybe
10. We ______ have time to help you tomorrow.
a. may
c. will
b. must
d. could.
11. “______ you hand me that pair of scissors, please?”
a. May
c. Shall
b. Will
d. Should
12. Jeanette did very badly on the exam. She _____ harder.
a.must have studied
c. could have studied
b. should have studied
d. must studied
13. He was very lucky when he fell off the ladder. He _____ himself.
a. could have hurt
c. must have hurt
b. should have hurt
d. will have hurt
14. Marcela didn’t come to class yesterday. She _____ an accident.
a. should have had
c. must have
b. might have
d. may have had
15. John still hasn’t come out. He ______ everything for the trip now.
a. must have been preparing
c. must be preparing
b. will be preparing
d. will have prepared
16. Thomas received a warning for speeding. He _____ so fast.
a. shouldn’t have driven
c. should have
b. would have driven
d. might have driven
17. The photos are black. The X-ray at the airport _____ them.
a. should have damaged
c. would have damaged
c. would damage
d. must have damaged
18. Tom didn’t do his homework, so the teacher became very angry. He _____ his homework.
a. must have done
b. should have done
c. might have
d. will have done
19. My car stopped on the high way. It _____ out of gas
a. may run
c. must be
b. may have run
d. should have run
20. Robert arrived without his book. He _____ it.
a. could have lost
c. would have lost
b. should have lost
d. will have lost

V. Rewrite the sentences, using a suitable conjunction.1. We know him. We know his friends.2. The coat was soft. The coat was warm.3. It is stupid to do that. It is quite unnecessary.4. I wanted to go. He wanted to say.5. I will come and see you. I leave for Moscow.6. He will tell you. You get home.7. I can,t express my opinion. I know the fact.8. We started very early. We didn,t want to miss the train.9. He will stay here. You come.10. He tried hard. He wasn,t successful.11. Your arguments are...
Đọc tiếp

V. Rewrite the sentences, using a suitable conjunction.

1. We know him. We know his friends.

2. The coat was soft. The coat was warm.

3. It is stupid to do that. It is quite unnecessary.

4. I wanted to go. He wanted to say.

5. I will come and see you. I leave for Moscow.

6. He will tell you. You get home.

7. I can,t express my opinion. I know the fact.

8. We started very early. We didn,t want to miss the train.

9. He will stay here. You come.

10. He tried hard. He wasn,t successful.

11. Your arguments are strong. They don,t convince me.

12. You can go there by bus. You can go there by train.

13. I was feeling tired. I went to bed when I got home.

14. I work in a restaurant. She works in the same restaurant.

15. He worked late last night. He might be free to go away tomorrow.

16. The room is small. We can,t all get in.

17. You had left earlier. You would have caught the train.

18. It has been raining hard all day. I can,t go out.

19. It rained hard. We played the football match.

20. You may go. He won,t forget you.

0
choose the best answer 1,I___to Singapore three times(A,have gone/B,have been/C,went/D,visited) 2,My brother can't swim__he's aftraid of water(A,because/B,but/C,and/D,so) 3,"I've just recived a cholaship"-"___"(A,really/B,thank you/C,congratulations/D,well) 4,choose the word that has the underlined part pronounced diffierently(A,ask/B,plastic/C,back/D,grandparent) 5,we will have a__ to look after the children(A,dishwasher/B,television/C,robot/D,computer) 6,Many girl and women__aerobics to...
Đọc tiếp

choose the best answer

1,I___to Singapore three times(A,have gone/B,have been/C,went/D,visited)

2,My brother can't swim__he's aftraid of water(A,because/B,but/C,and/D,so)

3,"I've just recived a cholaship"-"___"(A,really/B,thank you/C,congratulations/D,well)

4,choose the word that has the underlined part pronounced diffierently(A,ask/B,plastic/C,back/D,grandparent)

5,we will have a__ to look after the children(A,dishwasher/B,television/C,robot/D,computer)

6,Many girl and women__aerobics to keep fit(A,play/B,do/C,go/D,doing)

7,we might study__ computer at home(A,on/B,in/C,at)

8,we might go on holiday(A,in/B,from/C,to) the moon

9,we might have a(A,wire/Bwireless/C,wiring) TV so we can watch TV programmes from space

10,The weather in Da Nangcity is(A,hot/b,noisy/c,delicious)

13,walking to school will help__air pollution(A,reduce/b,reuse/c,recycle/d,refill)

15,Amsterdam is one of the __cities in the word(a,peacefulest/b,peacefuler/c,most peaceful/d,more peaceful)

16,__the film ia late, I will wait to watch it(a,because/b,when/c,but/d,although)

17,my father first__Da Lat in 2010(a,visited/b,went/c,go/d,been)

18,If the weather__good,I__camping with classmates.(a,is-willgo/b,is-go/c,will be-go/d,will ve-will go)

2
20 tháng 2 2018

choose the best answer

1,I___to Singapore three times(A,have gone/B,have been/C,went/D,visited)

2,My brother can't swim__he's aftraid of water(A,because/B,but/C,and/D,so)

3,"I've just recived a scholarship"-"___"(A,really/B,thank you/C,congratulations/D,well)

4,choose the word that has the underlined part pronounced diffierently(A,ask/B,plastic/C,back/D,grandparent)

5,we will have a__ to look after the children(A,dishwasher/B,television/C,robot/D,computer)

6,Many girl and women__aerobics to keep fit(A,play/B,do/C,go/D,doing)

7,we might study__ computer at home(A,on/B,in/C,at)

8,we might go on holiday(A,in/B,from/C,to) the moon

9,we might have a(A,wire/Bwireless/C,wiring) TV so we can watch TV programmes from space

10,The weather in Da Nangcity is(A,hot/b,noisy/c,delicious)

13,walking to school will help__air pollution(A,reduce/b,reuse/c,recycle/d,refill)

15,Amsterdam is one of the __cities in the word(a,peacefulest/b,peacefuler/c,most peaceful/d,more peaceful)

16,__the film ia late, I will wait to watch it(a,because/b,when/c,but/d,although)

17,my father first__Da Lat in 2010(a,visited/b,went/c,go/d,been)

18,If the weather__good,I__camping with classmates.(a,is-willgo/b,is-go/c,will be-go/d,will ve-will go)

29 tháng 3 2020

choose the best answer

1,I___to Singapore three times(A,have gone/B,have been/C,went/D,visited)

2,My brother can't swim__he's aftraid of water(A,because/B,but/C,and/D,so)

3,"I've just recived a scholarship"-"___"(A,really/B,thank you/C,congratulations/D,well)

4,choose the word that has the underlined part pronounced diffierently(A,ask/B,plastic/C,back/D,grandparent)

5,we will have a__ to look after the children(A,dishwasher/B,television/C,robot/D,computer)

6,Many girl and women__aerobics to keep fit(A,play/B,do/C,go/D,doing)

7,we might study__ computer at home(A,on/B,in/C,at)

8,we might go on holiday(A,in/B,from/C,to) the moon

9,we might have a(A,wire/Bwireless/C,wiring) TV so we can watch TV programmes from space

10,The weather in Da Nangcity is(A,hot/b,noisy/c,delicious)

13,walking to school will help__air pollution(A,reduce/b,reuse/c,recycle/d,refill)

15,Amsterdam is one of the __cities in the word(a,peacefulest/b,peacefuler/c,most peaceful/d,more peaceful)

16,__the film ia late, I will wait to watch it(a,because/b,when/c,but/d,although)

17,my father first__Da Lat in 2010(a,visited/b,went/c,go/d,been)

18,If the weather__good,I__camping with classmates.(a,is-willgo/b,is-go/c,will be-go/d,will ve-will go)

Đề bài: Complete the second sentence in each pair so that it means the same as the sentence before it. 1. She likes reading books in her free time. She is....................................................... 2. We will probably create a robot that can walk to school. We might........................................................................... 3. Peter could speak German when he was three, but Mary couldn't. Peter...
Đọc tiếp

Đề bài: Complete the second sentence in each pair so that it means the same as the sentence before it.

1. She likes reading books in her free time.

She is.......................................................

2. We will probably create a robot that can walk to school.

We might...........................................................................

3. Peter could speak German when he was three, but Mary couldn't.

Peter was.......................................................................................

4. Nam doesn't go to school every morning, but Lan does.

Lan...................................................................................

5. I could read an English book at the age of ten.

When I was ten, ................................................

6. Our imaginary robot can read anh write by in year 2030.

Our imaginary robot will ...................................................

7. We are going to buy a new car next year.

We will ...................................................

8. What an interesting story!

How ................................!

1
12 tháng 8 2017

Đề bài: Complete the second sentence in each pair so that it means the same as the sentence before it.

1. She likes reading books in her free time.

She is.......INTERESTED IN READING BOOKS................................................

2. We will probably create a robot that can walk to school.

We might.........CREATE A ROBOT CAN WALK TO SCHOOL..................................................................

3. Peter could speak German when he was three, but Mary couldn't.

Peter was..........ABLE TO SPEAK GERMAN WHEN HE WAS THREE BUT MARY COULDN'T............................................................................

4. Nam doesn't go to school every morning, but Lan does.

Lan.......GOES TO SCHOOL EVERY MORNING BUT NAM DOESN'T............................................................................

5. I could read an English book at the age of ten.

When I was ten, ............I WAS ABLE TO READ AN ENGLISH BOOK...................................

6. Our imaginary robot can read anh write by in year 2030.

Our imaginary robot will ...................BE ABLE TO READ AND WRITE BY IN YEARS 2030................................

7. We are going to buy a new car next year.

We will .......BUY A NEW CAR NEXT YEAR............................................

8. What an interesting story!

How .........INTERESTING THE STORY IS.......................!

12 tháng 8 2017

đúng ko

hihihihihihi

7 tháng 4 2019

1. If people can................... wastes, they will save a lot of money.

A. rebuild B. reduce C. reuse D. use

2. In the future, we won't go on holiday to the beach but we............ go on holiday to the Moon.

A. must B.can't C. might D. won't

3............the air is cleaner; people will have less breathing problems.

A. Unless B. When C. If D. Because

4. I might have a smartphone....................... the Internet.

A. surf B. surfing C. to surf D. to surfing

5. '' What can we do ......... air pollution?

A. reducing B. to reduce C. reduce D. to reducing

GOOD LUCKY

6 tháng 4 2019

1. If people can................... wastes, they will save a lot of money.

A. rebuild B. reduce C. reuse D. use

2. In the future, we won't go on holiday to the beach but we............ go on holiday to the Moon.

A. must B.can't C. might D. won't

3............the air is cleaner; people will have less breathing problems.

A. Unless B. When C. If D. Because

4. I might have a smartphone....................... the Internet.

A. surf B. surfing C. to surf D. to surfing

5. '' What can we do ......... air pollution?

A. reducing B. to reduce C. reduce D. to reducing