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第一节 单项填空(共10小题;每小题1分，满分10分)

21. As is known to all, _______ South Sea is _______ water of China’s dating from ancient time.

A. a; a              B. a; the    C. the; a         D. the; the

22. Friendship is something _______ being cared for, so we young people should treasure it.

A. worth         B. worthwhile       C. worthy of       D. worth of

In time of _______ you think is difficult, you may turn to _______ can help you.

A. what, whoever             B. which, whomever

C. what, no matter who      D. which, no matter whom

24. — Oh, you? Already back to China for a year? How long ____ you ____ in America?

— For about five years.