There is hardly an environment on earth _____ some species of animals or other have not adapted successfully.
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in which
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on which
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to which
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for which
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The great scientist became world-known in the early 1970s,______ he and another scientist made new discoveries about black holes.
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which
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where
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Qingming Day is also a day ____ people whose parents are dead visit the cemetery.
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then
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14．Life is like a ling race we compete with others to go beyond ourselves.
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why
B
what
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that
D
where