It is the idea____smiles can get rid of cold ____has been proved by the researchers many times.  
#85504
A
which; which
B
that; that
C
that; which
D
which; that
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-- I didn't realize how popular the restaurant was until I made a reservation the other day.-- I beg your pardon, but when __________?
#84904
A
was you realized it
B
it was that you realized it
C
you realized it
D
was it that you realized it
Why? I have nothing to confess(坦白). _________ you want me to say?
#85171
A
What it is that
B
How is it that
C
How it is that
D
What is it that