AIDS is said _______ the biggest health 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 |
You can improve your English ______ practicing more.
| A．by | B．with | C．of | D．in |
—What’s wrong with you, Eric? You look tired.
—I ______ to prepare for the final exam last night.
| A．picked up | B．woke up | C．stayed up | D．put up |
Tony is not as clever as Lucy, but he works ______ than her.
| A．hard | B．harder | C．hardest | D．the hardest |
—Why are you excited today?
—We have been told ______ a picnic this weekend.
| A．have | B．to have | C．having | D．had |
_______ great picture! Who painted it?
| A．How | B．What | C．How a | D．What a |