Take tug’s towing line to（）.

单项选择题Sorry to have kept you（）for a long time.

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

单项选择题Ships are always（）on water and they are easy to rust.

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

单项选择题She arrived at the anchorage last night and anchored（）berth.

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

单项选择题Shall we（）wait at the roadstead till there is a free berth for us?

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

单项选择题Routine radio communications should be no more than（）.

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