21. In __face of the global financial crisis, we must be all of __mind.
A. the; the B.不填; 不填 C. the; 不填 D. 不填;a
22. --- It's so cold! Why are your windows still open? --- Oh, they _______．
A. aren't closing B. won't close C. won't be closed D. aren't closed
23. Many people like to talk about generation gaps. I don’t think there is in my family, though.
A. it B. some C. none D. one
