用所给单词的适当形式填空。

1. This book is _____ (cheap) than that one.

2. He is _____ (friend) to me.

3. How many _____(sheep) are there on the hill?

4. Tom writes _____ (careful).

5. Please keep the door _____ (open).

6. This is _____ (she) book.

7. That is the _____ (good) music in the world.

8. Your coat is as _____ (new) as hers.

9. He is the best _____ (perform).

10. There are some _____ (child) in the park.