It is known to us __________ it was not until 1938 ________ the first colour TV programme began to be broadcast in the world.
#92541
A
that, which
B
/, /
C
that, that
D
which, that
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Only after the woman had her own child, _____ how difficult it was to be a mother.
#93519
A
did she realize
B
realized she
C
does she realize
D
she realized
John asked Tom ____ give him a lift to the office. 
#93583
A
if he could
B
could you
C
if could he
D
if could