Recently people have made great progress in using ____ power of nature to produce____ electricity.
| A．a; the | B．/; / | C．the; / | D．a; an |
University is ______ most worthwhile time of discovery and learning, and it is also ______very enjoyable and valuable experience for every one of us.
| A．a；a | B．a；/ | C．/；a | D．a；he |
— How do you find your trip to the Great Wall?
— We had an awful time! ______, George got sick the day we arrived.
| A．on the other hand | B．to begin with | C．as a consequence | D．on the contrary |
It was in the wooden house______ a businessman built by collecting funds______ the great scientist carried out the experiment that made a difference.
| A．which; that | B．where; that | C．that; where | D．that; which |
----To build a factory is beneficial to the locals, but on the other hand, it will be not environmentally friendly.
---- That’s_____ environmental protection organizations disagree.
| A．what | B．where | C．how | D．which |
I tried to apologize, but I think I ____ it the wrong way.
| A．set out | B．set about | C．set off | D．set up |