While watching television, ________.    
#68458
A
the doorbell rang
B
the doorbell was rung
C
we heard the doorbell ring
D
we heard the doorbell rings
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He never speaks to others until ______.
#67931
A
he speaks
B
spoken to
C
he is spoken
D
he speaks to
The camera is _______expensive________ I can't afford it. 
#67508
A
so, that
B
such, that
C
so, as to
D
enough, that