is recorded in the history book , Diaoyu Island has belonged to China since ancient times.
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As
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That
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Which
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What
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When deeply absorbed in work, _____ he often was, he would forget all about eating or sleeping.
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that
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which
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where
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when
China's population is expected to increase to about 1.5 billion in 2040, ______it will start to decline slowly.
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where
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which
C
on which
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after which
Li Ning was able to set up a school for gymnasts in 1991, ______ he has continued to help young people to achieve their sporting ambitions.
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when
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dring which
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since then
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since when