单项选择题

You must ______ at the airport an hour before your plane leaves.

A．check in
B．check out
C．check up
D．check on
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单项选择题
Robert Brown is a very proud person who ______ silence as contempt.
A．introduces
B．interprets
C．intends
D．interrupts
单项选择题
Mind you. It's easy to have your pocket ______ in a big crowd.
A．pick
B．picking
C．picked
D．being picked
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