1. _______ you have done might do harm to other people.

2. _______ he said at the meeting astonished everybody present.

3. _______ we can't get seems better than _______ we have.

4. It worried her a bit _______ her hair was turning grey.

5. _______ you don't like him is none of my business.

6. _______ the 2000 Olympic Games will be held in Beijing is not known yet.

7. _______ we'll go camping tomorrow depends on the weather.

8. _______ leaves the room last ought to turn off the lights. 

9. It is generally considered unwise to get a child _______ he or she wants.

10. Does _______ matter if he can't finish the job on time ?

11. _______ is a fact that English is being accepted as an international language.

12. It is necessary that a college student _______ at least a foreign language.