第二部分：英语知识运用（共两节,满分45分）
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.Though we left home very late，we the 1ast bus.
A. managed to catch
B. managed catching
C. tried to catch
D. tried catching
22. People in the west make a rule to buy Christmas presents for their relatives and friends.
A. that B. it C．this D. as
