一写出下列形容词的比较级
1 old_________2 busy________3 hot__________4 slow ____________
5 thin _______6 clean_______7big ___________ 8 cold ____________
9. fat_________10. nice ________ 11. heavy________12. cute__________
13. beautiful_______________ 14. popular____________
15. smart__________ 16.tall_________ 17. short __________
18.long __________ 19. short ___________ 20. hard ___________
