用方框內(nèi)所給詞組的適當(dāng)形式填空。
1.I ________ to be a volunteer to West China.
2.When are you allowed ________ with your friends?
3.They shouldn't be allowed to drive now.They aren't ________ at that age.
4.Young people ________ if they wear their own clothes.
5.We like to study with a group because we can ________ each other.
6.Our teachers ________ us so they never allow us to copy others' homework.
7.________ I saw one of my friends on a bus.