单项选择题
A. For two hours. B. At once. C. In the holds. D. Tomorrow.
You should （）a close watch on the hatches.A.lookB.giveC...
单项选择题You should （）a close watch on the hatches.
A.look B.give C.keep D.see
You （）use hooks when discharging bagged cargo.A.shouldB...
单项选择题You （）use hooks when discharging bagged cargo.
A.should B.shouldn’t C.must D.can
A little （）may cause great damage or loss.A.careB.carel...
单项选择题A little （）may cause great damage or loss.
A.care B.careless C.carelessness D.careful
