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This is the third book that he has written in the past five years, the first of       I really enjoyed.
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which
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them
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 Besides wildlife on land, there are species living in the oceans _______ we still know little.
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about which
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in which
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for which
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with which
The building ______ roof we can see from here is a hotel.
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which
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that　
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what
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whose
 When deeply lost in thought, _______ he often was, he would forget all about eating or sleeping. 
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that
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where
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which
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when
 (2013·重庆模拟)—When did your brother begin to show his interest in medicine? —It was a Saturday　　　he noticed his classmate experimenting on a frog in the lab.
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that
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what
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when
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which
My sister has bought a new car ________ color is bright red.
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its
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that
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whose
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which