EXERCISES ON MODAL VERBS:
vercise 1: Choose the best answer to complete the sentences.
1. t's a hospital. You
..... Smoke.
B. needn't
C. may not
D. don't have to
A mustn't
ie nas worked for more than 11 hours. He .. ..be tired after such hard work.
B need
A. must
C. had better
D. mustn ...
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