单项选择题

A.operateB.operatingC.operationsD.operatedAll the crew ……

All the crew must know the locations as well as the （）of the life-saving and fire-fighting appliances.

A.operate
B.operating
C.operations
D.operated

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单项选择题What kind of （）can be used for gas and chemical fires?

A.equipment
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A.kind
B.kinds
C.types
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A.smoke
B.smoked
C.smoking
D.to smoke

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A.sound
B.sounding
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D.signal

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A.control
B.controlling
C.controlled
D.controls