单项选择题

If you hear the fire（）, leave the building quickly.

A．warning
B．alarm
C．signal
D．bell

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单项选择题
He drove fast and arrived an hour（）schedule.

A．in advance
B．before
C．by
D．ahead of
单项选择题
We were working（）time to get everything ready for the exhibition.

A．against
B．in
C．on
D．ahead
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