Lawrence Craven, a doctor from the USA, is the author of several published reports, one of which introduced the idea in 1953 ________ aspirin could reduce the risk of heart attacks by thinning blood.
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A
when
B
where
C
that
D
which
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The whole Chinese people will never forget the day, May 12th, 2008, _______ the strong earthquake happened in Wenchuan.
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on which
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on that
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I can never forget the day _______ we worked together and the day ______ we spent together.
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when; which
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which; when
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where
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when
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I will fly to Hong Kong, ____ I plan to stay for three weeks.
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where
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which
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The lawyer seldom wears anything other than a suit ____ the season.
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whatever
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wherever
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whenever
D
however