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 |
—Hi, Tom! Could you spare me a minute? I want to have a word with you.
—Sure, Jean ____.
| A．You must be worried. | B．It doesn’t matter. |
| C．What’s up? | D．Why me? |
--Peter, hurry up! You ______ on the phone.
--Oh, I ______. Thank you.
| A．are being wanted; come | B．are wanted; am coming |
| C．want; come | D．will be wanted; should come |
It is a good plan in theory, but it _____ to be seen whether it works in practice.
| A．keeps | B．stays | C．stands | D．remains |
What do you think of the reason _____ he gave at the meeting yesterday?
| A．why | B．for which | C．that | D．in which |
Scientists say it may be five or six years ____ it is possible to test this medicine on human patients.
| A．since | B．after | C．before | D．when |