二、单项选择（共15小题，15分。每小题1分）
从各题A、B、C、D四个选项中，选出可以填入空白处的最佳答案。
21. ––Listen! Someone is knocking at the door. Is it Emily?
––It ______ be Emily. She has gone to Guangzhou.
A. must B. can’t C. needn’t D. may
22. In many places in China, ______ bicycle is still ______ popular means of transportation.
A. the; 不填 B. 不填; a C. the; a D. 不填; 不填
23. Anne asked John ______ he would like a part-time teaching job.
A. whether B. who C. that D. what
24. ––Can David take charge of the international department?
––I’m afraid it’s ______ his ability.
A. under B. within C. over D. beyond
25. My toothache ______ me. I thought it was going away but it’s getting worse and worse.
A. is killing B. kills C
