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) ___________________