Mary worked here as a ______ secretary and ended up getting a full-time job with the company.
| A．pessimistic | B．temporary | C．previous | D．cautious |
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 |
The computer, help we human beings have stepped into the information age, should be regarded as one of the most important inventions in the 20th century.
| A．which | B．whose | C．with its | D．with whose |