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EX1: choose the best answer

1) When                         the school?

 a) have you joined      b) did you joined        c) did you join      d) have you ever joined

2)                   in England ?

a) Did you worked         b) Have you ever worked        c) worked you       d) Didn't you worked 

3) That's the best speech                   

a) I never heard         b) I didn't hear           c) I used to hear              d) I've ever heard

4) He's the most diffcult housemate                       

a) I never dealt with       b) I never had to deal with      c) I've ever had to deal with    

d) I've never had to deal with

5)                 to him last week

a) I spoke      b) I've already spoken       c) I didn't spoke       d) I speaked

6)                 a contract last year and it is still valid

a) We have signed       b) We signed        c) We haven't signed       d) We sign

7)                from a business trip to France

a) I couse back     b) I came back     c) I never came back      d) I've just came back

8) Prices                 in 1995 but them              in 1996

a) rise/ falled       b) rose/ fell    c) have risen/ have fallen    d) rose/ have fallen

9) You               to a word

a) listened/ I haven't said     b) didn't listen/ I say   c) listened/saying  

d) haven't listend/I be said back

10) I can't believe that               the news

a) You haven't read     b) You didn't read   c) You don't read    d) You read not

 

3
22 tháng 7 2016

EX1: choose the best answer

1) When                         the school?

 a) have you joined      b) did you joined        c) did you join      d) have you ever joined

2)                   in England ?

a) Did you worked         b) Have you ever worked        c) worked you       d) Didn't you worked 

3) That's the best speech                   

a) I never heard         b) I didn't hear           c) I used to hear              d) I've ever heard

4) He's the most diffcult housemate                       

a) I never dealt with       b) I never had to deal with      c) I've ever had to deal with    

d) I've never had to deal with

5)                 to him last week

a) I spoke      b) I've already spoken       c) I didn't spoke       d) I speaked

6)                 a contract last year and it is still valid

a) We have signed       b) We signed        c) We haven't signed       d) We sign

7)                from a business trip to France

a) I couse back     b) I came back     c) I never came back      d) I've just came back

8) Prices                 in 1995 but them              in 1996

a) rise/ falled       b) rose/ fell    c) have risen/ have fallen    d) rose/ have fallen

9) You               to a word

a) listened/ I haven't said     b) didn't listen/ I say   c) listened/saying  

d) haven't listend/I be said back

10) I can't believe that               the news

a) You haven't read     b) You didn't read   c) You don't read    d) You read not

Chúc bạn học tốt ^^

22 tháng 7 2016

 

EX1: choose the best answer

1) When                         the school?

 a) have you joined      b) did you joined        c) did you join      d) have you ever joined

2)                   in England ?

a) Did you worked         b) Have you ever worked        c) worked you       d) Didn't you worked 

3) That's the best speech                   

a) I never heard         b) I didn't hear           c) I used to hear              d) I've ever heard

4) He's the most diffcult housemate                       

a) I never dealt with       b) I never had to deal with      c) I've ever had to deal with    

d) I've never had to deal with

5)                 to him last week

a) I spoke      b) I've already spoken       c) I didn't spoke       d) I speaked

6)                 a contract last year and it is still valid

a) We have signed       b) We signed        c) We haven't signed       d) We sign

7)                from a business trip to France

a) I couse back     b) I came back     c) I never came back      d) I've just came back

8) Prices                 in 1995 but them              in 1996

a) rise/ falled       b) rose/ fell    c) have risen/ have fallen    d) rose/ have fallen

9) You               to a word

a) listened/ I haven't said     b) didn't listen/ I say   c) listened/saying  

d) haven't listend/I be said back

10) I can't believe that               the news

a) You haven't read     b) You didn't read   c) You don't read    d) You read not

 

1. When ____________ the school? A) have you joined   B) did you joined   C) did you join     D) have you ever joined 2. _____________ in England?  A) Did you ever worked     B) Have you ever worked   C) Worked you           11D) Didn't you have worked 3. That's the best speech _________ A) I never heard       B) I didn't hear        C) I used to hear          D) I've ever heard 4. He's the most difficult housemate _____________________A) I...
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1. When ____________ the school?

A) have you joined   B) did you joined   C) did you join     D) have you ever joined

2. _____________ in England?  A) Did you ever worked     B) Have you ever worked   C) Worked you           11D) Didn't you have worked

3. That's the best speech _________

A) I never heard       B) I didn't hear        C) I used to hear          D) I've ever heard

4. He's the most difficult housemate _____________________A) I never dealt with.  B) I never had to deal with.  C) I've ever had to deal with.  D) I've never had to deal with

5. ______ to him last week.

A) I spoke     B) I've already spoken    C) I didn't spoke    D) I speaked

6. _____a contract last year and it is still valid.

A) We have signed      B) We signed    C) We haven't signed    D) We have sign

7. ______ from a business trip to France.

A) I come back   B) I came back   C) I never came back    D) I've just come back

8. Prices ________ in 1995 but then _____ in 1996.

A) rised _ falled   B) rose _ fell   C) have risen _ have fallen   D) rose _ have fallen

9. You ____________ to a word ____________A) listened _ I haven't said

B) didn't listen _ I say   C) listened _ saying     D) haven't listened _ I've said back

10. I can't believe that ________________ the news.A) you haven't read

B) you didn't read       C) you don't read        D) you read not.

11.You ……………… a lot since the last time I saw you.

A. changed            B. has changed      C. is changing     D. have changed

12. He………. more concerned about his social status since he started working there.

A. has been becoming               B. has become       C. became            D. will become

13. Travel ………… into a huge industry in the last few decades.

A. has turned         B. is turning          C. has been turning      D. have turned

14. Science …………. in leaps and bounds.

A. have advanced            B. has advanced    C. has been advanced      D. is advancing

Man ……………… great things.

A.is accomplished                    B. has been accomplishing

C. has accomplished                 D. have accomplished

15. I ……………. the report yet.

A. hasn’t completed                           B. completed 

C. have already completed                  D. have not completed

16. The rain ……………….. . It’s been raining for 3 hours.

A. has stop            B. is stopped         C. haven’t stopped         D. hasn’t stopped

17. They ……………… at the airport.

A. haven’t yet arrived               B. haven’t already arrived

C. hasn’t yet arrived                           D. didn’t arrive

18. We ………………. three power cuts this week.

A. has had             B. have had                     C. had                   D. is having

19. The team ……………. numerous setbacks so far.

A. experienced      B. have experience          C. has experienced       D. is experiencing

20. John ……………. for three tests this month.

A. sat                              B. have sat  C. has sat    D. is sitting

21………… you …………. abroad this year?

A. Has – been                 B. Has – gone        C. Have – be        D. Have – been

22. I …………….. three books by the same author since the last month.

A. has read B. have read C. read D. red

23. Kathy …………….. for three different companies since graduating two years ago.

A. has worked       B. have worked     C. have been worked   D. worked

24. This is the first time I ………….. to Germany.

A. has ever been    B. have been ever            C. has been ever    D. have ever been

25. He ………….. to France for ages.

A. has gone never B. have never gone          C. has never gone         D. never has gone

26. They ……………. skiing since they were 15.

A. have never gone         B. has gone never  C. has never gone D. have gone never

27. I …………….. a cold for two weeks.

A. has had                      B. have had           C. had        D. have been had

28. He ………… here for six months.

A. have been         B. has been being C. has been being         D. has been

29. My friend and I …………… for too long.

A. has been waited          B. has waited        C. have waited    D. have been waited

30. I…………….. Martha.

A. ‘s just seen        B. ‘ve just seen               C. ‘ve seen just    D. ‘s seen just

31. He ………………….. to her over the phone.

A. has only spoken          B. have spoken only

C. have only spoken D. has spoken only

32. Did you like the new Doctor Who season? – I …………… it yet.

A. hasn’t seen       B. has seen           C. have seen         D. haven’t seen

33. George is a very close friend of mine. We …………… each other for years.

A. knew                B. have known      C. has know        D. had knew

34. You’ve … for work too many times this year. If you’re not careful, you’ll be fired.

A, ‘ve been late               B. ‘s been late                 C. ‘ve be late       D. ‘s be late

2
2 tháng 7 2023

1.c.did you join

2. B. have you ever worked.

3. D.I've ever heard.

3 tháng 7 2023

1C

2B

3D

CHUYỂN ĐỔI TỪ HIỆN TẠI HOÀN THÀNH SANG QUÁ KHỨ ĐƠN ( VÀ NGƯỢC LẠI ) 1.Viết lại câu không thay đổi nghĩa: 1) This is the first time he went abroad. => He hasn’t………………………………………….. 2) She started driving 1 month ago. => She has………………………………………………………………… 3) We began eating when it started to rain. => We have………………………………………………………. 4) I...
Đọc tiếp

CHUYỂN ĐỔI TỪ HIỆN TẠI HOÀN THÀNH SANG QUÁ KHỨ ĐƠN ( VÀ NGƯỢC LẠI )
1.Viết lại câu không thay đổi nghĩa:
1) This is the first time he went abroad.

=> He hasn’t…………………………………………..
2) She started driving 1 month ago.

=> She has…………………………………………………………………
3) We began eating when it started to rain.

=> We have……………………………………………………….
4) I last had my hair cut when I left her.

=> I haven’t………………………………………………………….
5) The last time she kissed me was 5 months ago.

=> She hasn’t……………………………………………………….
6) It is a long time since we last met.

=> We haven’t……………………………………………………………
7) When did you have it ?

=> How long ………………………………………………………………….?..
8) This is the first time I had such a delicious meal .

=> I haven’t……………………………………..
9) I haven’t seen him for 8 days.

=> The last …………………………………………………..
10) I haven’t taken a bath since Monday.

=> It is ……………………………………………….

2.Chia các động từ trong ngoặc ra thì simple past hoặc present perfect:
1)We (studied) ……………a very hard lesson the day before yesterday…………………
2)We (have studied) …………………………………………almost every lesson in this book so far……………………
3)We (have never watched)……………………………..that television program………………………
4)We (watched) ………………………….an interesting program on television last night …………………..
5)My wife and I ……………………………………………(had travelled)by air many times in the past
6)My wife and I (travelled)……………….. to Mexico by air last summer
7)I (have read) ………………that novel by Hemingway sevaral times before.
8)I (read) …………………….that novel again during my last vacation .
9)I (had) …………………….a little trouble with my car last week.
10)However,I (have )……………………. no trouble with my car since then.

11) I (have ) ………………..this toy since my birthday.
12)We (live )………………….in HN for ten years now and like it a lot.
13)The last time I (go) ……………………to HN was in May
14)When my parents were on holiday I ( stay)……………… with my aunt for a week
15)I (not see ) my son for ages .He (not visit ) ……………………..me since May
16)Tom ( be) …………….to HN twice .He loves it very much
17)My sister (work ) ……………………for an enterprise for two years .That was after college
18)I (move)……………… to HN in 2001 .I (be ) ………….there a long time now
19)It was so cold today that I (wear)…………… a sweater at school
20)So far this month there (be )……………………. three robberies in this street
21)When I was young I (meet )…………..him three times
22)In the past few years ,it (become )……………….. more and more difficult to get into university
23)I (feel )………………better since I ( live) ……………….here
24) Since I (be ) ……………………in this city I ( not see)…………… him

3. Khoanh tron dap an dung

1. When ____________ the school?

a) have you joined b) did you joined c) did you join d) have you ever joined

2. _____________ in England?

a) Did you ever worked b) Have you ever worked c) Worked you d) Didn't you have worked

3. That's the best speech _________

a) I never heard b) I didn't hear c) I used to hear d) I've ever heard

4. He's the most difficult housemate _____________________

a) I never dealt with. b) I never had to deal with.

c) I've ever had to deal with. d) I've never had to deal with

5. ______ to him last week.

a) I spoke b) I've already spoken c) I didn't spoke d) I speaked

6. _____a contract last year and it is still valid.

a) We have signed b) We signed c) We haven't signed d) We have sign

7. ______ from a business trip to France.

a) I come back b) I came back c) I never came back d) I've just come back

8. Prices ________ in 1995 but then _____ in 1996.

a) rised falled b) rose fell c) have risen have fallen d) rose have fallen

9. You ____________ to a word ____________

a) listened I haven't said b) didn't listen I say

c) listened saying d) haven't listened I've said back

10. I can't believe that ________________ the news.

a) you haven't read b) you didn't read

c) you don't read d) you read not.

1
22 tháng 10 2017

CHUYỂN ĐỔI TỪ HIỆN TẠI HOÀN THÀNH SANG QUÁ KHỨ ĐƠN ( VÀ NGƯỢC LẠI )
1.Viết lại câu không thay đổi nghĩa:
1) This is the first time he went abroad.

=> He hasn’t gone abroad before.
2) She started driving 1 month ago.

=> She has started driving for 1 month.
3) We began eating when it started to rain.

=> We have begun eating since it started to rain.
4) I last had my hair cut when I left her.

=> I haven’t had my hair cut since I left her.
5) The last time she kissed me was 5 months ago.

=> She hasn’t kissed me for 5 months.
6) It is a long time since we last met.

=> We haven’t met for a long time.
7) When did you have it ?

=> How long have you had it?
8) This is the first time I had such a delicious meal .

=> I haven’t had such a delicious meal before.
9) I haven’t seen him for 8 days.

=> The last time I saw him was 8 days ago.
10) I haven’t taken a bath since Monday.

=> It is 6 days since I last took a bath.

2.Chia các động từ trong ngoặc ra thì simple past hoặc present perfect:
1)We (studied) ……studied………a very hard lesson the day before yesterday…………………
2)We (have studied) ……………………have studied……………………almost every lesson in this book so far……………………
3)We (have never watched)………………have never watched……………..that television program………………………
4)We (watched) ……………watched…………….an interesting program on television last night …………………..
5)My wife and I ………………………have travelled……………………(had travelled)by air many times in the past
6)My wife and I (travelled)………travelled……….. to Mexico by air last summer
7)I (have read) ……have read…………that novel by Hemingway sevaral times before.
8)I (read) …………read………….that novel again during my last vacation .
9)I (had) ……………had……….a little trouble with my car last week.
10)However,I (have )…………have had…………. no trouble with my car since then.

11) I (have ) ………have had………..this toy since my birthday.
12)We (live )………have lived………….in HN for ten years now and like it a lot.
13)The last time I (go) …………went…………to HN was in May
14)When my parents were on holiday I ( stay)………stayed……… with my aunt for a week
15)I (not see )haven't seen my son for ages .He (not visit ) …………hasn't visited…………..me since May
16)Tom ( be) ……has been……….to HN twice .He loves it very much
17)My sister (work ) …………has worked…………for an enterprise for two years .That was after college
18)I (move)………moved……… to HN in 2001 .I (be ) ……have been…….there a long time now
19)It was so cold today that I (wear)………wore…… a sweater at school
20)So far this month there (be )…………have been…………. three robberies in this street
21)When I was young I (meet )……met……..him three times
22)In the past few years ,it (become )…………became…….. more and more difficult to get into university
23)I (feel )………have felt………better since I ( live) ………lived……….here
24) Since I (be ) …………have been…………in this city I ( not see)………haven't seen…… him

3. Khoanh tron dap an dung

1. When ____________ the school?

a) have you joined b) did you joined c) did you join d) have you ever joined

2. _____________ in England?

a) Did you ever worked b) Have you ever worked c) Worked you d) Didn't you have worked

3. That's the best speech _________

a) I never heard b) I didn't hear c) I used to hear d) I've ever heard

4. He's the most difficult housemate _____________________

a) I never dealt with. b) I never had to deal with.

c) I've ever had to deal with. d) I've never had to deal with

5. ______ to him last week.

a) I spoke b) I've already spoken c) I didn't spoke d) I speaked

6. _____a contract last year and it is still valid.

a) We have signed b) We signed c) We haven't signed d) We have sign

7. ______ from a business trip to France.

a) I come back b) I came back c) I never came back d) I've just come back

8. Prices ________ in 1995 but then _____ in 1996.

a) rised falled b) rose fell c) have risen have fallen d) rose have fallen

9. You ____________ to a word ____________

a) listened I haven't said b) didn't listen I say

c) listened saying d) haven't listened I've said back

10. I can't believe that ________________ the news.

a) you haven't read b) you didn't read

c) you don't read d) you read not.

3 tháng 9 2016

Viết lại câu mà nghĩa không đổi:

1. Have you ever played a computer game before? 

=> Is this the first time you played a computer game?

2. What are you going to do after you graduate from shool? she asked me. 

=> She asked me where I was going to do after graduating from school.

3. The furniture was so expensive that I didn't buy it. 

=> The furniture wasn't cheap enough for me to buy.

4. You want someone to help you with your luggage. 

=> Would you mind someone helping you with your luggage.

5. I've never talked to the headmaster before. 

=> It's the first time I talked to the headmaster.

6. "Don't make such a mess in your room." said Mrs. Quyen to her son. 

=> Mrs. Quyen told her son not to make such a mess in his room.

7. The last time we went to London was two years ago. 

=>We haven't gone to London since two years ago.

8. Are you and Jane the same age? 

=> Are you as old as Jane?

3 tháng 9 2016

k pải đúng hết nhưng tick cho z, tksvui

30 tháng 7 2019

1.When was it had?

2.She is the most beautiful girl that I have seen

3.I have never read such a better than this before

30 tháng 7 2019

1. When did you have it?

=> How long...................?

6 tháng 12 2019

Choose the best answer a,b,c, or d to complete the sentences:

" ................................. to Hanoi?" "Yes, I went there last year."

A) Were you ever

B) Have you ever been

C) Did you ever go

D) Were you ever gone

9 tháng 12 2019

b

Bài tập câu trắc nghiệm câu điều kiện có đáp án ở phía cuối bài viết 1-If I ……….the same problem you had as a child, I might not have succeeded in life as well as you have. A-have B-would have C-had had D-should have 2-I………you sooner had someone told me you were in the hospital. A-would have visited B-visited C-had visited D-visit 3-………more help,I could call my neighbor. A-needed B-should I need C-I have neeeded D-I should need 4-………then what...
Đọc tiếp

Bài tập câu trắc nghiệm câu điều kiện có đáp án ở phía cuối bài viết
1-If I ……….the same problem you had as a child, I might not have succeeded in life as well as you have.
A-have B-would have C-had had D-should have

2-I………you sooner had someone told me you were in the hospital.
A-would have visited B-visited C-had visited D-visit

3-………more help,I could call my neighbor.
A-needed B-should I need C-I have neeeded D-I should need

4-………then what I know today,I would have saved myself a lot of time and trouble over the years.
A-had I known B-did I know C-If I know D- If I would know

5-Do you think there would be less conflict in the world if all people…….the same language?
A-spoke B-speak C-had spoken D-will speak

6-If you can give me one good reason for your acting like this,……this incident again.
A- I will never mention B-I never mention C-will I never mention D-I don’t mention

7-I didn’t know you were asleep.Otherwise,I…….so much noise when I came in.
A-didn’t make B-wouldn’t have made C-won’t make D-don’t make

8-Unless you ……all of my questions,I can’t do anything to help you.
A-answered B-answer C-would answer D-are answering

9-Had you told me that this was going to happen, I…….it.
A-would have never believed B-don’t believe C-hadn’t believed D-can’t believe

10-If Jake……..to go on the trip, would you have gone?
A-doesn’t agree B-didn’t agree C-hadn’t agree D-wouldn’t agree

3
14 tháng 6 2017

Bài tập câu trắc nghiệm câu điều kiện có đáp án ở phía cuối bài viết
1-If I ……….the same problem you had as a child, I might not have succeeded in life as well as you have.
A-have B-would have C-had had D-should have

2-I………you sooner had someone told me you were in the hospital.
A-would have visited B-visited C-had visited D-visit

3-………more help,I could call my neighbor.
A-needed B-should I need C-I have neeeded D-I should need

4-………then what I know today,I would have saved myself a lot of time and trouble over the years.
A-had I known B-did I know C-If I know D- If I would know

5-Do you think there would be less conflict in the world if all people…….the same language?
A-spoke B-speak C-had spoken D-will speak

6-If you can give me one good reason for your acting like this,……this incident again.
A- I will never mention B-I never mention C-will I never mention D-I don’t mention

7-I didn’t know you were asleep.Otherwise,I…….so much noise when I came in.
A-didn’t make B-wouldn’t have made C-won’t make D-don’t make

8-Unless you ……all of my questions,I can’t do anything to help you.
A-answered B-answer C-would answer D-are answering

9-Had you told me that this was going to happen, I…….it.
A-would have never believed B-don’t believe C-hadn’t believed D-can’t believe

10-If Jake……..to go on the trip, would you have gone?
A-doesn’t agree B-didn’t agree C-hadn’t agree D-wouldn’t agree

15 tháng 6 2017

1 ,C

2, A

3,B

4,A

5,A

6,A

7,B

8,B

9,A

10,C

Chúc bạn học tốt hihi, cho mik 1 tick nha ok

các bn giúp mk với I) Tìm và sửa lỗi các từ sai :1) nga `sthe girl standing beside of the letter box a b c d 2) how many times in a day do you brush your teeth ? a b c d3) I entered the dentist`s surgery , feeling little scared a b c d4) Doctor lai looked at minh and told him do not worry...
Đọc tiếp

các bn giúp mk với hihi

I) Tìm và sửa lỗi các từ sai :

1) nga `sthe girl standing beside of the letter box

a b c d

2) how many times in a day do you brush your teeth ?

a b c d

3) I entered the dentist`s surgery , feeling little scared

a b c d

4) Doctor lai looked at minh and told him do not worry

a b c d

5) we are happy hearing that you have passed your final exams

a b c d

6) stay far from sweets bacause they are not good for your teeth

a b c d

7) you should take regular exercise in order to stay healthily

a b c d

8) eating well and to exercise regularly help prevent a cold

a b c d

9) don`t go out in this awful weather ; you had better to stay indoors

a b c d

10) the common cold is unpleasent , but nobody know a cure for it

a b c d

II) Chọn các từ trong ô và điền vào ô trống :

look aftertreatacheexaminesufferkeepcure

operate

 

I am a family doctor. I have a nurse to help me ans a receptionist to help the patients when they come to see me . When I see patients in my surgery , firstI listen to their problems , then I (a) them. Then , if i can , I (b)

them for their illness . Some simply have sore throats , headaches or flu and I give them a prescription to take to the chemist . Others (c) from serious diseases of the heart , lungs stomch or event brain . I can`t always (d) them myself and sometimes I have to send them to hospital for treatment . If something is seriously wrong with them , the hospital will decide to (e) on them . The trouble is people don`t (f) themselves properly . It really isn`t so difficult to (g) well. .If your head begins to (h) , have a rest . If you always fell tired , get more exercise . Eat well . Have a good diet . And have a regular check-up with the doctor vui

 

 

2
1 tháng 1 2017

C
A
C
D

4 tháng 2 2017

C A C D BẠN NHÉ

14 tháng 4 2017

1. The tables was so heavy I could ___ lift it

C. hardly

2. You can find a book with either the author _________the title

C . about

3. I'm going to the Post Office . I_____some stamps

A. am going to need

4. A taxi took my father to the airport ,.......he caught a plane to Hanoi

(Sai đề)

5. The first things many people do when want_____weight is dramatically cut their calories

B . to lose

6. The police advised the children to tell____

B. the truth

14 tháng 4 2017

1. The tables was so heavy I could __lift it

a. even b. almost c. hardly d, nearly

2. You can find a book with either the author _________the title

a. or b. and c . about d . with

3. I'm going to the Post Office . I_____some stamps

a. am going to need b . am needing c. need d. will need

4. A taxi took my father to the airport ,.......he caught a plane to Hanoi

a. have you ever gone

b have you ever arrived

c did you ever go

d. have you ever been

5. The first things many people do when want_____weight is dramatically cut their calories

a. to gain

b . to lose c. to cut d . to decrease

6. The police advised the children to tell____

a. the true b the truth c. information d. facts

29 tháng 10 2016

13, Talk ………………

a. joe about it ; b. with joe for it ; c. it with joe ; d. to joe about it

14, What was that? – Don’t ask me. I ………………

a. don’t have any idea what was it ; B. Have got no idea of it ;C. don’t have any opinion what it was ; D. Have got no idea what it was.

15, “………………?” – “He doesn’t look very well.”

a. what is he like ; b. what does he look ; c. how well is he ; d. how is he

16, You learned to type at secondary school, ………………?

a. don’t you ; b. didn’t you ; c. did you not ; d. weren’t you

17, You haven’t been to France, ………………?

a. have you ; b. didn’t you ; c. had you ; d. hasn’t you

18, She doesn’t have any children, ………………?

a. hasn’t she ; b. has she ; c. does she ; d. doesn’t she

19, I don’t know what ……………… do.

a. will ; b. should ; c. can ; d. to

20, I shall never get used ……………… on the left.

a. to drive ; b. to driving ; c. drive ; d. driving

29 tháng 10 2016

13.c

14.a

15.b

16.b

17.a

18.c

19.d

20.a