按要求完成下列各题。 1. know (同音词) ___________________ 2. fast (比较级) ___________________ 3. fast (反义词) ___________________ 4. country (复数形式) ___________________ 5. city (复数形式) ___________________ 6. leave (反义词) ___________________ 7. west (反义词) ___________________ 8. buy (同音词) ___________________ 9. younger (反义词) ___________________ 10. tall (反义词) ___________________ 11. this (反义词) ___________________ 12. that (复数形式) ___________________ 13. go (第三人称单数形式) ___________________ 14. do (第三人称单数形式) ___________________ 15. have (第三人称单数形式) ___________________ 16. bus (复数形式) ___________________ 17. glass (复数形式) ___________________ 18. first (基数词) ___________________ 19. do (现在分词) ___________________ 20. north (反义词) ___________________