The reason why they failed the test was ____ they didn’t sleep at all the night before.
#79384
A
because
B
why
C
that
D
for which
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The only existing problem is ____ we can find this special wood in the forest in such a short time.
#79383
A
when
B
where
C
that
D
whether
He was seriously injured last week and that’s _______ he didn’t participate in the competition.
#79363
A
when
B
how
C
why
D
what
Believe it or not，I'm sure that is ________ people call the six sense.
#79344
A
when
B
what
C
which
D
why
_______ difficulty we meet with, we must finish it on time, because the opportunity is_______ valuable．
#79498
A
Whatever; such
B
However; such
C
However; so
D
Whatever, that
Water, which seems so simple and common, is ______ makes life possible.
#79418
A
what
B
that
C
which
D
how