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單項(xiàng)選擇題

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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單項(xiàng)選擇題

The signals that will be used for emergency should be clearly （）.

A. set out
B. set off
C. get off
D. cut off

單項(xiàng)選擇題

The fire drill is （）. You are dismissed.

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