从A、B、C、D四个选项中，选出可以填入空白处的最佳答案。
21．--- Xiao Ming won’t break his word, will he ?
--- _______________.
--- Do you mean I often break my word?
A. No problem. B. Nobody acts like you.
C. That’s all right. D. I beg your pardon.
22．From the day we enter ______ university, we know ________ fierce competition for jobs is waiting us upon graduation.
A. an; a B. a; a C. a; / D. the ; /
