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 It’s difficult for any of us to eat better , exercise more, and sleep enough, ________ we know we should.
A because B even if C as if D unless
22 The result was good enough for Liu Xiang to win the ________, but far off his former world record and personal best of 12.88 seconds.
A power B advantage C title D item
