A.has returnedB.have returnedC.has returnD.have returnO……

单项选择题I（）major damage to navigational instruments.

A.has
B.had
C.have
D.have to

单项选择题You are running（）danger.Fog bank ahead of you.

A.to
B.at
C.in
D.into

单项选择题We（）let go port anchor.

A.are going to
B.is going to
C.were going to
D.was going to

单项选择题（）shackles in the water?

A.Many
B.Much
C.How many
D.How much

单项选择题What is anchoring position（）me?

A.on
B.for
C.to
D.at