Choose the best answer (A, B, C, D) to complete the following sentences

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Bài 2: Choose the best answer (A, B, C F D to complete the tonowing sentences.
1. You
use your mobile phone in the exam.
A. oughtn't to B. mustn't
C. don't have to
D. shouldn't
2. My grandparents live in the suburb. Therefore, whenever we visit them, we
A. must take B. should take C. have to be taken
D. have to take
3. We
smoke on the bus.
A. mustn't
C. needn't
4. There are a lot of tickets left, so you
A. mustn't
B. won't
C. should
D. don't have to
5. You
eat plenty of fruit or vegetables every day because they are good for your health.
A. oughtn't to
B. mustn't
C. don't have to
D. should
6. You
wash the car. I had it done yesterday.
A. mustn't
B. needn't
C. must
7. She is a good teacher; thus, I think you
B. must
C. have
B. can't
A. oughtn't
8. It's a secret. You
A. mustn't
9. Vietnamese school
A. have to
10. We
A. must B. mustn't
11. When swimming in the pool, children
A. should
B. must
B. needn't
A. shouldn't
15. I think you
D. mightn't
pay for the tickets in advance.
B. need to
D. may not
to ask her for some advice.
D. ought
let anyone know about it.
C. mightn't
idents nowadays
wear uniform.
C. should
D. could
open the lion's cage. It is contrary to zoo regulations.
C. needn't
D. should
12. If you want to maintain a good relationship, you
A. ought to not B. ought not to C. mustn't
13. This drink isn't beneficial for health. You
A. should
14. This warning sign says that you
B. mustn't
C. don't have to D. have to
be accompanied by their parents.
D. may not
D. don't have
B. ought to not C. ought not to D. mustn't
behave impolitely like that.
drink it too much
step on the grass.
C. don't have to D. ought not to
do exercise regularly in order to keep in shape.