By the year of 2053 there will be 487 million aged people in China， means that one third of the population will be over 60.
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推荐题目
The wrong you have done to him is terrible，________， in my opinion，you should apologize to him.
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which
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that
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what
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for which
The settlement is home to nearly 1,000 people，many of______left their village homes for a better life in the city.
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whom
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which
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them
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those
Students should involve themselves in community activities they can gain experience for growth.
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who
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when
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which
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where
With economy getting worse，we have reached the point________we have to cut down our daily expenses.
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that
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which
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when
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where