12.　 --- I drove to Zhuhai for the air show last week.

--- Is that _____ you had a few days off?

11.　 You are saying that everyone should be equal, and this is _____ I disagree

10.　 Go and get your coat. It’s ____ you left it.

9.　　　 It was about 600 years ago ____ the first clock with a face and an hour hand was made.

8.　　　 It is said that the famous football star is not willing to play for ______ would pay him three million dollars a year.

7.　　　 _____ has helped to save the drowning girl is worth praising.

6.　　　 ____ is a fact that English is being accepted as an international language.

5.　　　 There is some doubt ____he will come.

4.　　　 The question is ____ it is worth doing.

3.　　　 _____ she comes or not makes no difference.