The reason why they failed the test was ____ they didn’t sleep at all the night before.
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A
because
B
why
C
that
D
for which
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Although he has become wealthy, Mr. Wood remains ________ he used to be, modest and friendly.
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when
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Water, which seems to be so simple and common, is ______ makes life possible.
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that
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Honesty is a basic element in friendsmaking and that is ________ it requires to keep everlasting friendship.
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