The head of the company promised to deal with matters of this sort _____he returned to his office．
#32768
A
until
B
while
C
by the time
D
the moment
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Just a few minutes every day, _______ you could have shining floors and furniture with this new cleaner.
#34772
A
but
B
and
C
or
D
so
. The concert was a great success--there wasn’t a single empty seat in the concert hall, ____ it was very cold.
#34181
A
because
B
when
C
unless
D
although
I was wondering what to do with my car which won't start ________ a kind man offered to help.
#30256
A
while
B
and
C
so
D
when