1编号：3863题型：单选题测试正确率：70.7%
Trees ______fight air pollution. They are natural air conditioners.
2编号：3862题型：单选题测试正确率：75.78%
— Must I do the work today? — No, you _______. You may do it tomorrow.
3编号：3856题型：单选题测试正确率：88.19%
— Can I wear any clothes I like to school? — No, you can’t. You______ wear a uniform.
4编号：3852题型：单选题测试正确率：57.53%
— Something ________terrible. What goes bad in the kitchen? — The meat.
5编号：3850题型：单选题测试正确率：85.76%
— _____ I use your ruler, Lingling? — Sure. Here you are.
6编号：3849题型：单选题测试正确率：74.97%
— Must I leave the room now? — No, you______.
7编号：3848题型：单选题测试正确率：67.76%
— Who＇s that man? Is he Mr. Brown? — That_____ be Mr. Brown. He never walks this way.
8编号：3846题型：单选题测试正确率：86.34%
The museum is quite far. It will take you half ______ hour to get there by______ bus.
9编号：3845题型：单选题测试正确率：81.65%
Bill is______ English teacher. He likes playing ______ football.
10编号：3844题型：单选题测试正确率：84.88%
Shanghai is in______ east of China.
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