II． 单项填空（共15小题；每小题1分，满分15分）
21. ---I’m afraid I must be off now .
--- ____________________ .
A. No problem B. Never mind C. Step slowly D. See you soon.
22.—Daddy, can you buy me a new MP3 when you go to Beijing?
—You ______ get one if you are admitted to a key middle school.
A. could B. shall C. may D. can
