He _____ do the butterfly swimming technique when he was five years old.
A. can
B. could
C. may
D. might
14. In my opinion, you _____ visit your grandparents next week.
A. should
B. must
C. may
D. shall
15. You _____ step on the grass. The management forbids it.
A. should
B. shouldn’t
C. must
D. mustn’t
16. I am sorry. I really _____ come yesterday. A. could
B. couldn’t
C. had
D. hadn’t
17. You _____ study harder or you are going to fail.
A. should
B. must
C. may
D. shall
18. I _____ go out tonight. I have a lot of tasks to accomplish.
A. can’t
B. shouldn’t
C. mustn’t
D. might not
19. If you are interested in human life, you _____ study biology.
A. can
B. may
C. should
D. have to
20. They _____ bring anything to the class party, but they can if they want to.
A. could
B. don’t have to
C. shall
D. mustn’t
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Answer:
13.a
14.b
15.a
16.b
17.a
18.a
19.c
20.a