第二部分：单项选择（共15小题;每小题1分,共15分）
21. —Won’t you join us in playing tennis?
—_____ I’d rather watch it than play it.
A. Why not? B. No, thanks. C. Go ahead. D. Have fun!
22. Because he has been out of _____ work for months, the young man now depends on his parents for _____ living.
A. 不填; a B. the; a C. 不填; 不填 D. the; 不填
23. Not knowing what to do next, the girl __ ___ her parents for advice.
