All the guests at the party were dancing and singing happily _____ the electricity was cut off.
#30392
A
until
B
while
C
when
D
because
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— What a shame ! It turned out to be a failure.— We missed a process,_______ we could not succeed in the experiment.
#31685
A
and otherwise
B
and therefore
C
or perhaps
D
but luckily
Mr. Green has made another wonderful discovery, ______ great importance to science.
#34201
A
which I think is of
B
which I think it is of
C
that I think is of
D
I think which is of
______this difficulty is overcome, other problems will be easy to solve.
#33583
A
For
B
Whether
C
Once
D
Though
Several weeks had gone by____I realized the painting was missing.
#31267
A
as
B
before
C
since
D
when
That was really a splendid evening. It's years________I enjoyed myself so much.
#30061
A
when
B
that
C
before
D
since