第二部分：单项填空(每题1分，共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. I hope, first of all, that we shall never lose _____ heart in face of _____ failure.
A. the; a B. the; the C. 不填; 不填 D. a; 不填
22. The two sportsmen congratulated each other _____ winning the match by shaking hands.
A. with B. on C. in D. to
