23. train (v.) 训练----training (n.) ---- trainer (n.)

22. sell (sold/ sold) sell sth. to sb.

　buy (bought / bought)　 buy sth. for / from sb.　　　 buy sth. for money

21. suitable (adj.)/ fit

20. continue to do sth. = continue doing sth.　 / go on with sth./ go on doing sth.

19. medicine (u.n.) / medical (adj.) medical care　 / take some medicine / pill(s)　 / traditional Chinese medicine

18. character ----characteristic(s)

17. poison (n.) / poisonous (adj.)

16. step (stepped) on the grass　 / step by step

15. spit (spitting/ spat / spat) in a public place

14. attack (v.)袭击 ---- attacker (n.) / attract (v.)吸引 attract sb. to….　 ---- attractive