----- Nội dung ảnh -----
**Circle the correct answer (A, B, C or D) to complete the following 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 bus.
A. must take
B. should take
C. have to be taken
D. have to take

3. We ________ smoke on the bus.
A. mustn't
B. can't
C. needn't
D. mightn't

4. There are a lot of tickets left, so you ________ pay for the tickets in advance.
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

7. She is a good teacher; thus, I think you ________ ask her for some advice.
A. oughtn't
B. must
C. have
D. ought

8. It’s a secret. You ________ let anyone know about it.
A. mustn't
B. oughtn't
C. mightn't
D. may not

9. Vietnamese school students nowadays ________ wear uniform.
A. have to
B. need to