- Was it because of his laziness_______ he didn't do the experiment successfully?- No, it was because of his carelessness.
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that
B
while
C
for
D
as
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The case is rare ______ a man can be cured of such a terrible disease.
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when
B
where
C
how
D
that
Two years later, her father disappeared, never to be _________ again.
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heard from
B
hear about
C
hear of
D
heard out
Cheer up! Everyone may have periods in their lives everything seems tough.
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which
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where
C
when
D
that