根据句意填空。

1. We should not cut            too many trees.

2. I'd like you            (come) to supper.

3. Is he good at            (run)?

4. My sister usually            (wash) her clothes on Sundays.

5. Mr Zhang           (not work) in Beijing.

6. The book isn't easy            (read).

7. She            (have) an apple now.

8. What size            you            (need)?

9.            (swim) is good for our health.

10. Why not             (sing) an English song?