二.单项选择（共15小题；每小题1分，满分15分）
从A、B、C、D四个选项中，选出可以填入空白处的最佳选项。
21. In recent years, with the help of our teacher , I have made_____ rapid progress in ____math
A. a; the B. a; 不填 C. 不填; the D. 不填; 不填
22．—Jim，are you sure I'm invited to the party next Sunday?
—______I saw your name on the invitation list.
A．Definitely. B．Not at all. C．Goodness! D．That's great!
23．—Are we allowed ______the hall?
—Sorry，I'm afraid not.
A．entering B．entered C．to enter D．enter
24．With another four people______，the bus became even more crowded.
