19. experience 20. biology　 21. requires　 22. majority　 23. variety　　 24. various

13. average　 14. universities 15. libraries　 16. appreciate　 17. possibilities 18. explanations

11. convenient　　 12. restaurants

7. destroy　 8. practicable 　9.imagine　 10. soldiers

1. decision　 2. Recovering　 3. measures　 4. arranged　 5. precious　　　 6. provide

10.suggests11. cruel　 12. message13. Suffering 14. heated 15. breathe 16. promise 17. valuable　 18. role19. cover　　 20. arrival　 21. envelope 22. sentenced 23. satisfied 24. prevented25. weight 26. introduced　 27. thirsty 28.separated　 29. serious　 30. praised31. advance　 32. advantage　 33. purpose 34. mention35.particular36.patient37.relationship 38. regretted　 39. regular　 40. regards　 41. straight　 42. respect43. remained　 44. remind　 45. progress 46. signed　 47. traffic　 48. reduced49. recognize　 50. permitted

形式2：

2.　　　 　3. spoken　 4. Generally 5. memories　 6. continue7. taking　 8. trade　 9. situation

1. owe 2. Forgive

49. His work is of a very high ________ (标准).　 50. He arrived ______(立即)after I left.

形式1：

47. His husband is _______(一倍) her age. 48. We’ve got ________(辉煌)achievement in recent years.