The bad weather meant__________ the rocket launch（发射）for 48 hours,．
| A．delaying | B．having delayed |
| C．to delay | D．to have delayed |
The workers insist that the company should take measures to improve their working condition.
| A．attractive | B．effective | C．impressive | D．conservative |
Ifunsolved, the problem of food safety may lead to more serious results.
| A．having left | B．to leave | C．left | D．leaving |
—How's your project work going, Jack?
—. I'm half finished with it.
| A．So far so good | B．It's up to you | C．Never mind | D．Forget it |
—Tom almost ran into a pole yesterday while driving on the highway.
—I suppose he too fast.
| A．had driven | B．was driving | C．drives | D．has driven |
A completely new situation is likely to when the new law comes into effect.
| A．arise | B．rise | C．raise | D．rose |