Not until all the fish died in the river, ____ how serious the pollution was.
A. did the villagers realize B. the villagers realized
C. the villagers did realize D. didn’t the villagers realize
The fact ________ she seemed to develop normally was very encouraging.
A．where B．of which C．what D．that
America was______was first called India by Columbus.
A．that B．where
C．what D．the place
—Hey, if you can't enjoy that at a sensible volume, please use the earphone. I'm studying.
—Oh, I'm sorry. I_______ _realize it________ you.
A．don't; bothers B．didn't; bothered
C．don't; was bothering D．didn't; was bothering
Is there a supermarket around ______ I can buy a pair of new shoes?
A．that B．which
C．what D．where
AIDS is said________the biggest challenge to both men and women in that area over the past few years.
A．that it is B．to be
C．that it has been D．to have been
