用适当的词填空。
1. We shouldn't 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?
