第二部分：词汇知识运用（共两节，满分40分）
第一节：多项选择（共10小题；每小题1分，满分10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. My schedule is very ________ right now，but I'll try to fit you in.
A. tight B. short C. regular D. flexible
22. Yao Ming，the Houston Rockets' All Star center, was once ______ a stress fracture(骨折)in his left foot that nearly ended his NBA season.
A. diagnosed with B. treated with
C. cured of D. discovered with
23. The Somali robbers' frequent attacks on the sea urged the United Nations to ________ all nations to take immediate action.
A. fight for B. apply for C. call on D. wait on
24. She thought it was worthwhile for her to teach in the small village to make a ________ to the life of the children there.
A. difference B. sense C. study D. discovery
25. It's certainly hard work. But, ________, a man who wishes to have a career has to make a great many sacrifices.
A. on the contrary B. as a result
