海 淀 区 高 三 年 级 第 二 学 期 模 拟 练 习 英 语 2011.04第二部分:知识运用(共两节,45分)第一节 单项填空(共15小题;每小题1分,共15分)从每题所给的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. Life is ten percent what happens to you and ninety percent _ you respond to it.A. that B. whether C. how D. what 22. Mr. Smith _ these days. I think he should take a holiday before he burns out. A. has been overworking B overworked C. had overworked