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It is necessary to explain your theory _____, otherwise the   audience won't make sense of what you are trying to get across.
#25300
A
on purpose
B
at length
C
at random
D
on average
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 I apologize ___ you ____ my impoliteness.
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to , for
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/ , for
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 You can improve your English ______ practicing more.
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by
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with
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regardless of
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in; with
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with; in
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#27124
A
of
B
for
C
to
D
on