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.

1. us. listening, well, English, doing, helps, practice, learn, to
    ________________________.
2. you, use, speaking, front, be, of, group, English, to, in, of, afraid, a, did
    ___________________________?
3. allowed, teenagers, to, go, with, their, every, night, be, should, out, friends
                                                                            .
4. volunteering, do, us. longer, time, like, would, to. things, vacations, give
                                                                            .
5. choose, of ,I, pair, can't, to, buy, which, jeans
____________________________________.