第一节 单项填空（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,并在答题卡上将该项涂黑。
21. It is hoped that there will be ______ time in the future when _____man can beat all diseases.
A. a; the B. a; 不填 C. 不填; the D. 不填；不填
22. --Did you buy the wonderful shoes?
--Yes. They told me it would be cheap but _____ it cost me nearly $700.
A. as a result B. in a word C. at last D. in fact
