A. of; in                  
B. on; with        
C. of; on                
D. with; for

1. I can't choose which pair of jeans _______ (buy). They both look good on me.
2. Why do you look _______  (sleep)?
3. Everyone needs to have at least eight _______ (hour) sleep a night.
4. But we do think that our son needs to be _______ (real).
5. My parents have always taught me the _______  (important) of working hard.
6. Children shouldn't be allowed _______  loudly in class. (shout).
7. He should stop _______  (wear) that silly sweater.
8. It's probably a good idea for parents _______  (allow) teenagers to study in groups.
9. Do you think children should _______  (allow) to play computer games..
10. At our school, we sometimes have a special day _______  (help) others.