单项选择题

One thief went inside while the other waited outside and _________ the police.

A．watched out
B．watched for
C．watched over
D．looked out
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单项选择题
There are three types of volcanoes: active volcanoes, dormant volcanoes and _________ volca- noes.
A．extinguished
B．extinct
C．distinct
D．instinctive
单项选择题
It's taken ages to _________ the flu.
A．get over
B．get on
C．get through
D．get by
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