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。
21. -----I don’t know whether I should choose science as my main subject of study, Mum.
-----I leave to your own judgment whether you should do it.
A. that B. this C. it D. what
22. They advocate the proposal we were opposed re-discussed at the next meeting.
A. was B. should be C. to was D. to be
23. -----Larry, I will call you at 6 o’clock tomorrow morning.
-----Thanks, Mum. But it’s too early. I then.
A. am sleeping B. am to sleep C. will be sleeping D. has slept
24. Rescue services in Western societies take the principle that children are not mature enough to make life
