Bài 2: Choose the best answer (A, B, C or D) to complete the following sentences.
use your mobile phone in the exam.
C. don't have to
2. My grandparents live in the suburb. Therefore, whenever we visit them, we
C. have to be taken
1. You
A. oughtn't to
B. mustn't
D. shouldn't
a bus.
A. ...
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