________ the Internet is bridging the distance between people, it may also be breaking some families or will cause other family problems.
#29956
A
When
B
If
C
While
D
Since
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I was about to give up my effort to solve a problem __________ a good idea struck me.
#30835
A
when
B
while
C
until
D
before
Our class will go to the National Park next Sunday ——________ it rains, of course.
#31174
A
when
B
unless
C
for
D
whether
—Did you meet with the famous star?—______ I had come here earlier.
#33473
A
Only if
B
If only
C
But for
D
As long as