Đáp án C

A. won’t: sẽ không
B. needn’t: không cần
C. mustn’t: không được
D. mightn’t: có thể sẽ không
Dịch nghĩa: Đây là vấn đề tuyệt mật. Cậu không được nói với ai khác.

Đáp án là C

Dịch: nó là một bí mật lớn. Bạn … nói với bất kỳ ai về nó-> mustn’t= không được.

Đáp án: won’t

Dịch: Đó là một bí mật vì vậy hãy hứa bạn không nói cho ai biết.

It is a secret so promise you ______won’t_____________ tell anyone.

D => must not

A => tell

A => don't have to

chew => chewing

C -> many generations

1.We have a lot of work tomorrow .You must be late!

2.You mustn’t to tell anyone what I just told you. It’s a secret.

3. We have to rush. We’ve got plenty of time.

4.When chew food, we shouldn’t talk.

5. My family has followed this tradition for many generation. - It’s good .

1. D  mustn't 

2. A  tell

3. A  don't have to

4. B  chewing

5. C  generations

8. A

9. D

8A

9D

1. Hannah may /can/ might ski really well and she often wins competitions.

2. I might / can / couldn’t go to the party but I’m still not sure.

3. This is our secret, so you mightn’t / mustn’t / don’t have to tell anyone else.

4. It’s dangerous to go into deep water if you mightn’t / can’t / may not swim.

5. I think you must / should / have to go out more and meet new people.

6. I don ’t feel very well so I may / can / have to stay in tonight.

7. You don’t have to / mustn't / mightn’t come with us if you don’t want to.

8. Passengers ought to / must / should remain in their seats while the plane is landing.

9. May / Must / Could you please phone me in the evening?

10. To get a driving license, you may / should / have to be 18 or over.

B. mustn't

1.This is a top secret. You ..... tell anybody about it.

A.needn't B. mustn't C.need D. must

16. A 
17. D
18. a
19. A
20. B
21. D
22. D
23. A
24. A
25. C
26. A
27. C
28. D
29. D
30. B
31. C

16. You ______ tell Sandra anything about our story. She ______ keep a secret.

      A. had better not / cannot                                       B. needn’t / would rather not

      C. ought to / would not                                          D. do not have to / should not

17. I am not really sure where Beverly is. She ______ in the living room, or perhaps she is in the backyard.

      A. could not sit                B. cannot sit                  C. must be sitting         D. might be sitting

18. With luck, tomorrow ______ be a sunny day.

      A. could                           B. must                         C. would rather             D. needn’t

19. Dane ______ the book we borrowed from the library. It was on the table, but now it has gone.

      A. must have returned                                           B. should have returned

      C. cannot have returned                                        D. needn’t have returned

20. You ______ translate that. I understand what you say.

      A. wouldn’t                     B. needn’t                     C. mustn’t                     D. couldn’t

21. You ______ be right but I am not sure so I am going back to check anyway.

      A. can                               B. must                         C. should                      D. might

22. You ______ the air pressure in your tires if you do not want to get a flat tire on your trip.

      A. should be checked                                             B. do not have to check

      C. mustn’t check                                                    D. ought to check

23. The computer does not work. It ______ during transportation.

      A. must have been damaged                                 B. should have been damaged

      C. can be damaging                                               D. will damage

24. Mary decided not to join us for dinner. She ______ stay at work to finish the marketing report.

      A. had to                          B. must                         C. can                           D. may

25. You ______ book the tickets for the play in advance because they sell out quickly.

      A. could                           B. mustn’t                     C. have to                     D. may

26. You can’t mean that! You ______

      A. must be joking             B. can be joking            C. can joke                    D. have to joke

27. If Daisy has not come home yet, she ______ for us at the school gate.

      A. can’t be waiting          B. would be waiting     C. must still be waiting      D. will be waiting

28. It ______ Sam who called and did not leave a message on the answering machine. I am not sure.

      A. must be                        B. might be                   C. must have been        D. might have been

29. Margaret promised to meet us at the entrance to the theater tomorrow night. She ______ for us when we get there.

      A. mustn’t be waiting                                            B. could not be waiting

      C. ought to be waiting                                           D. might have been waiting

30. What do you have in mind? - I ______ prefer a long dress.

      A. will                              B. would                       C. can                           D. must

31. She ______ a lot after his husband’s accident. That was why her eyes were so red and swollen.

      A. must be crying             B. can have cried          C. must have cried        D. will have cried

Mustn’t: hàm ý bạn không được làm gì hoặc không có lựa chọn nào khác

Don’t have to lại có nghĩa là không cần thiết, tức là bạn có “toàn quyền” quyết định xem có làm việc đó hay không. 

Trong trường hợp này hành động nói cho mọi người là không được phép (theo ý kiến chủ quan của người nói) => dùng mustn’t

Đáp án: You mustn’t tell anyone. It is a big secret.

Tạm dịch: Bạn không được nói cho ai biết. Đó là một bí mật lớn.