National flag should not be （）up.

单项选择题You should keep national flag（）.

A.flying
B.flew
C.flown
D.flies

单项选择题You should slack the mooring lines （）when the wind is big.

A. at the same time
B. on time
C. in time
D. at times

单项选择题We must （）to inspect the problems about the safety of fire prevention.

A.prepares
B.preparing
C.prepared
D.prepare

单项选择题When you keep a gangway watch, you should （）the mooring lines according to the rise and fall of the tide.

A.adjusted
B.adjusting
C.adjusts
D.adjust

单项选择题Lower gangway into place and （）safety net.

A.fast
B.make fast
C.fasten
D.fastened

单项选择题We should hoist national flag （）.

A. on time
B. in time
C. soon
D. at times

单项选择题We should often （）the bow and stern of a ship.

A.inspects
B.inspecting
C.inspect
D.inspected

单项选择题They will （）out a more detailed inspection.

A. carried
B. carrying
C. to carry
D. carry

单项选择题I’ll （）the sheet carefully.

A. go after
B. go off
C. go through
D. go away

单项选择题They will（） against pirates and pilferage.

A. take place
B. take over
C. take measures
D. take up