30.It was_________ back home after the experiment.
| A．not until midnight did he go | B．until midnight that he didn’t go |
| C．not until midnight that he went | D．until midnight when he didn’t go |
It’s really a great pity that the great writer died ____ his works unfinished.
| A．for | B．with | C．from | D．of |
It is hoped that there will be ____ time in the future when ____ man can defeat cancer.
| A．a; the | B．a; 不填 | C．不填; the | D．不填; 不填 |
Scientists warn us _____ the need to keep an eye ____ the greenhouse effect.
| A．to; in | B．of; to | C．in; on | D．of; on |
The old temple, which ______ to the 17th century, needs to be repaired.
| A．was dated back | B．dates back | C．is dated back | D．dated back |
---Who do you think should ____ the responsibility for white pollution?
--- Both the producer and the consumer.
| A．burden | B．replay | C．answer | D．undertake |