用所给单词的适当形式填空。

1. _____ (not drop) litter carelessly.

2. Are they interested in _____ (play) badminton?

3. Listen! The music  _____ (sound) beautiful.

4. Tom with his friends  _____ (plant) trees when I saw him.

5. Thousands of visitors go to Zhalong _____ (go) birdwatching every year.

6. Amy studies hard and she is _____ (good) student in her class.

7. It is _____ (possible) for us to finish so much homework in one week.

8. You can't believe what he told you because he is _____ (honest).

9. Peter is much _____ (strong) than Kitty.

10. September is the _____ (nine) month of the year.

11. I would rather _____ (watch) TV than go shopping with you.

12. It is warmer in southern areas than in _____ (north) areas.

13. He failed in this English test because of his _____ (careful) work.

14. What prevented you from _____ (come) to my birthday party yesterday?

15. I like all kinds of music, _____ (include) classical music.