27. please (v.) ---- pleasant / pleased (adj.)　 ---- pleasure (n.)　　 be pleased with sb.

26. appear (v.)---- appearance (n.)　 disappear ---- disappearance

25. comfortable / uncomfortable ---- uncomfortably (adv.)

24. nervous

23. agree / disagree　 ----

agree with sb. / agree to sth.

22. be famous for…/ be famous as…

21. social 社会的

20. in the future

19. solve problems　 / work out the problems

18. activity / after-school activities (pl.)