第二部分：英语知识运用（共两节，满分45分）
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，并在答题卡上将该项涂黑。
例：It is generally considered unwise to give a child _______ he or she wants.
A. however B. whatever C. whichever D. whenever
答案是B。
21. — It’s getting late. I'm afraid I must be going now.
—OK. ______ .
A. Take it easy B. Go slowly C. Stay longer D. See you
