The palace caught fires three times in the last century,and little of the original building   now.
#102970
A
remains
B
is remained
C
is remaining
D
has been remained
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The key you have just got     the front door. 
#102563
A
is used to opening
B
is used to be opened
C
is used to being opened
D
is used to open
—What’s that unpleasant noise?—Oh, the road before the main gate          .
#102240
A
is repairing
B
is being repaired
C
is repaired
D
has been repaired