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單項選擇題

（）we stand away from the church bell, it takes time for the sound waves to each us.

A.If
B.Whenever
C.Because
D.Where

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單項選擇題

Before（）,a station shall take precautions to ensure that its emission will not interfere with transmission already in progress.

A.transmit
B.to transmitting
C.transmitting
D.in transmitting

單項選擇題

The emergency communication set’s transmitter should not be tested except when（）by a public radio inspector.

A.inspecting
B.inspected
C.inspects
D.having inspected