單項選擇題In case of accidents()the risk of sinking,all effective measures shall be taken to steer clear of the fairway to avoid()the traffic.

A.involving/impeding
B.involved/to impede
C.involving/to impede
D.involved/impeding


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2.單項選擇題If the sling bumps()the beams,serious accidents may follow.

A.at
B.on
C.into
D.against

3.單項選擇題I have()damage below water line.

A.large
B.big
C.important
D.major

5.單項選擇題He must have had an accident,or he()then.

A.would have been here
B.should be here
C.had to be here
D.would be here