Students are required to go out in couples, especially in the evenings, with friends ______ they get into trouble.
#30775
A
even if
B
if only
C
in case
D
when
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______ is well known to everyone, I should say, is that a man becomes learned by asking questions.
#31205
A
Who
B
It
C
As
D
What
_________ I picked up the receiver, I realized that someone had dialed the wrong number.
#34776
A
The moment
B
A moment ago
C
After a minute
D
Minute after
It is a difficult problem for high school students they can properly use the Internet．
#30653
A
what
B
where
C
when
D
whether