第一节 单项选择题 （共10小题，满分10分）
21. ----Daddy, can you buy me a new MP4 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
22. ----Who______ it be that is knocking at the door?
----It ______ be Father, but I’m not sure.
A. can; must B. must; can C. can; may D. may; must
