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Everyone will go through life's stages of ups and downs, ________ self­respect plays a key role in the maturity(成熟) of a person.
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when
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which
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as
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that
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The old professor has three sons，________are doctors.
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all of them
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They talked for about an hour of things and persons ________ they remembered in the school.
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I used to live near the People’s Park　　　　is the centre of town.  
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Who is the person 　　　　　is standing at the school gate ?
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I think the writer _______ wrote the book is very creative.
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which
B
who
C
when
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