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. However ____ important school life may be, ___ great influence of parents can’t be ignored or discounted by the teacher.
A. an; a B. the; the C. an; / D. /; the
22. It rained heavily for three days ____ and they were separated from the outside world.
A. in the end B. on end C. by the end D. at the end
23. The plan was difficult to ____ ; it______ wonderfully.
A. carry out, worked out B. be carried out, worked out
C. carry out, was worked out D. be carried out, was worked out
24. Don’t bother your mother tonight, because she has got a lot ____ his mind.
