Xiao Li was about to cheat in the exam ________ the teacher came up, smiling to him.
#69571
A
as
B
when
C
while
D
until
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This is the least wonderful TV play ___.
#71695
A
what I have ever seen
B
I have ever seen
C
I have ever seen it
D
that I have ever seen it
You will be late_______you leave immediately. 
#72164
A
until
B
if
C
or
D
unless
London,______ last year, is a nice old city.
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A
that I visited
B
which I visited
C
I visited
D
where I visited