You need some facts _____ to base your theory.
#94221
A
where
B
on which
C
in place where
D
in the place
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You’d better leave the windows _________ and the door ___________.
#96278
A
open, closed
B
opened, closing
C
opened, close
D
open, close
All flights___ because of the snowstorm, we decided to take the train. 
#94777
A
were canceled 
B
had been canceled
C
having canceled
D
having been canceled
When I returned, I found the windows open and something      .
#91600
A
to steal
B
stealing
C
stolen
D
being stolen