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單項選擇題

In the IMO SMCP the situations（）phrases using the work “can” appear it clear whether a possibility is referred to.

A.where
B.when
C.after
D.unless

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單項選擇題

（）it is advisable to remain on a VHF channel 8, say: “stand by on VHF channel 8”.

A.That
B./
C.When
D.What

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