— Why do you do volunteer work in the North-West?
— I___ to improve the lives of the children there through my efforts．
| A．was trying | B．have tried |
| C．am trying | D．tried |
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 |
Her failure in the experiment suggested that she ______ the professor’s instructions.
| A．should not follow | B．would not follow | C．hadn’t followed | D．hasn’t followed |