單項選擇題

You should keep national flag（飄揚）（）.

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

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單項選擇題

（）（調(diào)整）ropes when necessary.

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

單項選擇題

I shall keep the﹙保安巡邏)（） .

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