用所给词的适当形式填空。

1. Oh, it's seven o'clock. It's time______ (go) to school.

2. The box is too heavy. Let me ______ (help) you.

3. Lily _____ (have) some picture books.

4. Listen! Who ______ (sing) in the room?

5. There ______ (be) a boy and some girls over there.

6. Sometimes he _______ (watch) TV in the evening.

7. The two boys are _______ (China).

8. Tom, with his friends, _________ (be) playing football over there.

9. There are five ______ (sheep) under the tree.

10. There are many _____ (cloud) in the sky.