词形转换：
1. succeed→____________(n.) →___________ (adj)→________________(adv)
2. think→ (n)_________________
3. ill→ (n) ___________
4. miss →(adj) _________
5. conclude→ (n) ________
6. introduce →(n) ______
7. lead→ (n) ________
8. produce→ (n) __________
9. pride →(adj) ________
10. decide→(n) __________
11. bad→_______(比较级)→________(最高级)
12. peace→ (adj) _________________
13. die→______(adj) →__________(n.)
14. introduce(v.)→_____________(n.)引进
15. decide(v.)→____________(n.)决定
16. medicine(n.)→___________(adj.)医学的
过去式、过去分词：
17. grow→__________→ ______________
18. come→____________→_____________
19. spend→____________→ __________
20. become→__________→ ______________
21. know→__________→ ______________
22. fall→_________→ ______________
23. understand→____________→ ___________
24. speak→__________→ ____________
25. choose→_________→ ____________