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 |
The teacher asked us ___________ so much noise.
| A．don’t make | B．not make | C．not making | D．not to make |
－Is that 110? A thief is in my house…
－ Ok, help is ______.
| A．in the way | B．in its way | C．on the way | D．by the way |
—Do you know where David is? I can’t find him anywhere.
—Well . He have gone far— his coat’s still here.
| A．shouldn’t | B．mustn’t | C．can’t | D．wouldn’t |
Dan caught two ________birds in the wood last week and they are still ________in the cage.
| A．alive; live | B．live; live | C．live; alive | D．lived; alive |
These doctors are busy day and night, a cure for AIDS.
| A．bringing on | B．pulling on | C．taking on | D．working on |