III/ Choose the best answer (A, B, C or D) to complete the following sentences.
1. 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
2. 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
3. You__________use your mobile phone in the exam.
A. oughtn’t to
B. mustn’t
C. don’t have to
D. shouldn’t
4. I think you__________do exercise regularly in order to keep in shape.
A. must
B. should
C. ought to
D. Both B and C are correct
5. The children__________spend too much time watching TV.
A. mustn’t
B. ought to not
C. shouldn’t
D. Both B and c are correct
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