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單項(xiàng)選擇題

You should （）a close watch on the hatches.

A.look
B.give
C.keep
D.see

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單項(xiàng)選擇題

You （）use hooks when discharging bagged cargo.

A.should
B.shouldn’t
C.must
D.can

單項(xiàng)選擇題

A little （）may cause great damage or loss.

A.care
B.careless
C.carelessness
D.careful

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