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.