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

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单项选择题

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

单项选择题

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

单项选择题

A.length and width of space
B.length of space only
C.width of space only
D.neither length nor width