用所给词的适当形式填空。
1. Can he ________ (swim)?
2. My father ________ (have) a computer.
3. Why do you want ________ (join) the club?
4. ________ (thank) very much.
5. The clothes at the store ________ (be) cheap and nice.
6. Do you like ________ (swim) at the pool?
7. ________ (not talk) in class!