1编号：4094题型：单选题测试正确率：22.4%
Global warming is a great ______ to us.
2编号：4093题型：单选题测试正确率：83.77%
He has so many hobbies, ______ reading, music, sports and so on.
3编号：4092题型：单选题测试正确率：57.79%
Please check your paper to ______ mistakes.
4编号：4091题型：单选题测试正确率：51.62%
Such things happen ______.
5编号：4090题型：单选题测试正确率：55.84%
When did the war ______?
6编号：4089题型：单选题测试正确率：56.49%
We are supposed to ______ our teachers.
7编号：4088题型：单选题测试正确率：87.34%
Don’t speak loudly ______.
8编号：4087题型：单选题测试正确率：75.65%
We must ______ the traffic rules when we go out.
9编号：4072题型：单选题测试正确率：60.39%
A friend ______ is a friend indeed.
10编号：4071题型：单选题测试正确率：71.75%
It’s important to ______ our friends.
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