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 Living in the mountain area has its problems, ________ obtaining water is a big problem.
#66944
A
of which
B
for what
C
as
D
whose
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Is oxygen the only gas ________ helps fire burn?
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/
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The result of the survey shows         successful people have in common is        they all have confidence.
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whether; that
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Clean water and fresh air are essential for our daily life, _______ we can’t live.
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Both parents and teachers work hard at either preventing failure or protecting the children from the knowledge_______ they have failed.
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why
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