单项选择题

He did his best to stay awake, but the performance was so boring that he just ______ to sleep.

A．dropped away
B．dropped out
C．dropped off
D．dropped down
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单项选择题
Mother kept inviting Mrs. Smith to stay for lunch, and finally she ______.
A．gave back
B．gave off
C．gave up
D．gave in
单项选择题
The actors have to ______ before they appear in front of the strong lights on television.
A．cover up
B．make up
C．paint up
D．do up
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