单项选择题

Americans have been criticized for placing too much ______ on being on time.

A．emphasis
B．activity
C．bother
D．assistance
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单项选择题
My petrol tank was empty so I pulled into a garage to ______ .
A．fill up
B．speed up
C．blow up
D．wind up
单项选择题
Look ______ ! There's a car coming.
A．up
B．out
C．back
D．over
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