單項(xiàng)選擇題Sorry to have kept you()for a long time.

A.waiting
B.wait
C.waited
D.to wait


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1.單項(xiàng)選擇題Ships are always()on water and they are easy to rust.

A.float
B.floating
C.floats
D.floated

2.單項(xiàng)選擇題She arrived at the anchorage last night and anchored()berth.

A.waiting
B.awaiting
C.awaiting for
D.waited

3.單項(xiàng)選擇題Shall we()wait at the roadstead till there is a free berth for us?

A.must
B.ought to
C.have to
D.never

4.單項(xiàng)選擇題Routine radio communications should be no more than().

A.one minute
B.three minutes
C.five minutes
D.eight minutes

5.單項(xiàng)選擇題PORT A BIT SLUGGISH means that port rudder().

A.answers very well
B.rudder answers all right
C.answers slow
D.answers fast