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。
21．---_________ ?
---I’m not sure, but he might have been ill in bed.
A. What do you think has happened to Tom
B. What do you think Tom has happened
C. Do you think what has happened to Tom
D. Do you think what Tom has happened
22．The successful launch of Shenzhou VI ______ everyone involved in the space project making an effort.
A. reminded of B. cared for C. relied on D. called up
