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Before the conference, a new problem came up __________ could speak on behalf of our group.
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As food is to the body, ______ is learning to the mind.
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      time passed, however, the carnival period was extended.
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_____H7N9 is a deadly virus, it is still safe to eat thoroughly-cooked chicken.
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People in Chongqing are proud of       they have achieved in the past ten years.
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  (2012·衡阳高二检测) People often have the belief _______ a healthy environment and development cannot be possible at the same time, but this does not have to be true.
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