单项选择题

Efficient fire-fighting drill demands the full （）of persons in all departments of the ship.

A.operate
B.operation
C.co-operate
D.co-operation

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单项选择题
The signals that will be used for emergency should be clearly （）.

A. set out
B. set off
C. get off
D. cut off
单项选择题
The fire drill is （）. You are dismissed.

A.finish
B.finished
C.begin
D.beginning
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