12. A. though B. as C. as if D. since

13. A. to prepare B. to be preparing C. preparing D. prepare for

14. A. angry B. excited C. glad D. amused

15. A. that B. whether C. what D. so that

16. A. surprised B. surprising C. sorry D. tired

17. A. things B. name C. car D. property

18. A. before B. later C. recently D. ago

19. A. None B. Both C. Neither D. All

20. A. ever B. never C. still D. yet

第三部分：练习答案：

1－5 BCACB 6－10 CDCCD 11－15 AACAB 16－20 ABABB