While watching television,______.
#80789
A
the doorbell rang
B
the doorbell rings
C
we heard the doorbell rings
D
we heard the doorbell ring
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He left home in 1980 and has never come back ____. 
#84129
A
though
B
while
C
when
D
since
Not until recently _______ paid work outside the home.
#83041
A
most mothers in Britain took
B
did most mothers in Britain take
C
took most mothers in Britain
D
were most mothers in Britain taken
So little ______ about stock exchange that the lecture was completely beyond me.
#83948
A
did I know
B
I had known
C
I knew
D
was I known
Between the two mounts___and they decide to build a ropeway(索道). 
#83915
A
lies a very deep valley
B
does a very deep valley lie
C
a very deep valley lies
D
a very deep valley lays