一、用括号内所给词的适当形式填空。
1. I think children shouldn't (allow) to swim in the river alone.
2. Mom doesn't allow me to get my ears (pierce) because I'm too young.
3. He never stops (talk). He's really outgoing.
4. Teenagers should be allowed (choose) their own friends.
5. Young people need (sleep) more than the old.
6. The washing machine doesn't work well. It needs (repair).
7. For your own (safe), you shouldn't climb mountains alone.
8. Mr. Wu always spends a lot of time (explain) things to us.
9. His brother likes cars. He learned how (drive) last year.
10. Tina is really excited about (go) to China on vacation.

1. be allowed 2. pierced 3. talking 4. to choose 5. to sleep 6. repairing/to be repaired 7. safety 8. explaining 9. to drive 10. going

()1.Do you think ______ should work at night?
A.sixteen-years old
B.sixteen-year-olds
C.sixteen years-old
D.sixteen-year-old

B