27. The famous star _____ in the gym several hours every day to keep fit.
| A．takes up | B．turns out | C．gives away | D．works out |
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 |
I would rather you _____ the truth now instead of afterwards.
| A．will know | B．knew | C．should know | D．Know |
The police came here in the hope ___ they could learn about the cause of the traffic accident.
| A．that | B．what | C．which | D．How |