單項選擇題（）in the open air has given you a good color.

A.Work
B.Worked 
C.Working
D.To be working


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1.單項選擇題The river （） to the east. It is the second longest river in the country.

A.runs
B.is  running
C.run
D.ran

2.單項選擇題"The ceremony has already started." "Look! The flag（）now."

A.is being raised
B.is risen
C.is being rose 
D.is raising

3.單項選擇題I feel it's an honor（）to attend the opening ceremony of the new bank.

A.to invite
B.of being invited 
C.to be invited
D.having invited

4.單項選擇題---- I do apologize for knocking you down. ----（）

A.No, I’m perfectly all right.
B.You’re all right.
C.Don’t worry about it.
D.Not at all. Thank you

5.單項選擇題The world's supplies of copper（）

A.have gradually being exhausted
B.are gradually exhausted
C.has been gradually exhausted 
D.are being gradually exhausted