用所给词的适当形式填空。
1. When the car (invent)?
2. I want to go somewhere (relax)
3. A stranger was seen (go) into the teacher's office by the girl.
4. Knocking into players and falling down would be . (danger)
5. The coat is used for (keep) water away.
6. (be) a volunteer is great.
7. I fix up bikes and give (they) away to children.
8. I love places where the people are really (friend)
9. I love singers (whom) write their own music.
10. Teenagers should (allow) to choose their own clothes.
1. was invented 2. relaxing 3. to go 4. dangerous 5. keeping
6. Being 7. them 8. friendly 9. who 10. be allowed