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B. needn't
C. might not
stand up. There are a lot of seats available on the bus.
A. mustn't
D. couldn't
15. You
A. couldn't
B. mustn't
C. needn't
D. might not
16. People who use public parks
clean
after themselves.
up
B. may
C. ought
A. must
D. might
17. This library book is overdue. I
better return it today.
A. need
B. must
C. might
D. had
18. Our company provides free advice on the use of our products. You
pay us.
A. must
B. have to
C. needn't
D. mustn't
19. Whatever
come, I will always be by your side.
A. must
B. may
C. could
D. need
you hand that book, please?" "Sure. Here it is."
C. Must
=
20. "
A. Could
B. Should
D. May