A.HoistB.TopC.LowerD.Bring（）（降）the flag.……

单项选择题You should keep national flag（飘扬）（）.

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

单项选择题（）（调整）ropes when necessary.

A.Try
B.Adjust
C.Notice
D.Operate

单项选择题I shall keep the﹙保安巡逻)（） .

A. coast patrol
B. inshore patrol
C. patrol service
D. security patrol

单项选择题Where are（危险货）（）carried on board?

A. dangerous goods
B. safe goods
C. A or B
D.A+B

单项选择题It shows mourning when you lower（）(半旗).

A. half-mast
B. dip the mast
C. flag line
D. flag mast