单项选择题

These regulations ______ people under the age of 21.

A．include in
B．relate to
C．subject to
D．send in
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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
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
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