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 |
---So you made it?
---Yes. It was so dark that we managed to avoid ________.
| A．seeing | B．to see | C．being seen | D．to be seen |
Chengdu has _______traffic that all the schools in it had a day off on the first day of the Western China International Economy and Trade Fair (西博会)to avoid traffic jams.
| A．such a heavy | B．such heavy |
| C．so heavy | D．so heavy a |
To her joy, Della earned first the trust of her students and then _______of her colleagues.
| A．that | B．one | C．ones | D．those |
If we _______ now to protect the environment, we'll live to regret it.
| A．hadn't acted | B．haven't acted |
| C．don't act | D．won't act |
My mother was over the age limit and ________, her application for the job was refused.
| A．as a result | B．in conclusion |
| C．worse still | D．what’s more |