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You can cross the road ____________ other people, because the drivers can see you ____________. ( )
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After John had been in London for three years, he and his wife had a lot to tell ________.
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It's important _______ students _______ their homework.
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已知等差数列{an}的公差d≠0,且a1、a3、a9成等比数列,则
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