Only when the villagers were faced with water shortage___       how serious the problem of water pollution was.
#84498
A
did they realize
B
will they realize
C
they did realize
D
were they realized
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_____,she may not catch up with her sister Lisa. 
#83885
A
Hard though she works
B
Hard although she works
C
Hard works she
D
Hard even if she works
___,we could forgive him for his mistakes! 
#83907
A
Were he still a child
B
If he is still a child
C
Is he still a child
D
He were still a child
—How much do you know about the 3D film technology?—A little. Not until _______the hot movie Avatar _______ some about it.
#82709
A
did I see; did I begin to learn
B
I saw; I began to learn
C
I saw; did I begin to learn
D
did I see; I began to learn