Is it only when you fail _________ you will be aware of your mistakes?
#85051
A
that
B
and
C
or
D
unless
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—Do you know   they got to know each other? —It was last year   they both taught Chinese in Scotland. 
#84734
A
when was it that; when
B
when it was that; that
C
when it was that; when
D
when was it that; that
It was ______ his office.
#84830
A
not until the rain stopped did he leave
B
not until did the rain stop that he left
C
not until the rain stopped when he left
D
not until the rain stopped that he left
Could it be in the classroom_____ we had a talk last night _____you left your keys? 
#85182
A
that; where
B
in which; where
C
where; that
D
where; in which