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. It’s quite obvious that the aging population in China will cause _____ heavy pressure on _____whole society in the future.
A. a; / B. /; / C. a; the D. the; a
22. The film “A World without Thieves”a great success and brought in a large profit to the cinema .
A. appreciated B. enjoyed C. won D. seized
23. --Can I have something to eat, Mum? I feel hungry.
-- You ____ be hungry. You’ve just had some bread and ham.
A. mayn’t B. won’t C. mustn’t D. can’t
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