You can keep all the files and documents you think it is convenient to get them．
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what
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how
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where
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推荐题目
I’d like to start my own business ---- that’______ I’d do if I had the money.
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that
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what
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where
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whether
(2013·高考新课标全国卷Ⅰ)There’s no way of knowing why one man makes an important discovery________another man，also intelligent，fails.
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since
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if
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as
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while
The researchers found clear and convincing evidence _________ happiness is the key when it comes to better health and longer lives.
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where
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whether
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how
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that
________ the fire breaks out，he is the first to arrive at the scene.
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Every time when
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Moment
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No matter whenever
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Every time
With the development of science,a computer is to a manager_______a gun is to a soldier.
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as
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what
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that
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when