单项选择题

One of the responsibilities of the Coast Guard is to make sure that all ships _________follow traffic rules in busy harbors.

A．cautiously
B．dutifully
C．faithfully
D．skillfully
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单项选择题
The fact that the management is trying to reach agreement _________five separate unions has led to long negotiations.
A．over
B．upon
C．in
D．with
单项选择题
As the economy improves, workers' fears of being laid off have_________.
A．disposed
B．discarded
C．departed
D．disappeared
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