A refusal to work part of the day only may（）to be a strike even though such refusal is not in breach of contract.

A port is（）if the delay in leaving it would be such as to frustrate the adventure．

A.not good
B.unsafe
C.safe
D.obtainable

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A port（）if more than ordinary prudence and skill is needed to avoid exposure to danger there.

A.safety
B.is safe
C.is not safe
D.is not safety

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