After decades of effort, the city is still trying to _____ how to stop smoking in public places.
| A．try out | B．let out | C．figure out | D．run out |
__________ fishes are usually more expensive than __________ ones, because it's not easy to keep them __________.
| A．Alive; frozen; live | B．Living; freezing; live |
| C．Live; freezing; living | D．Live; frozen; alive |
-Hello! Is Mr. John in the office?
-Yes. But I'm sorry. He is busy __________ and can't speak to you.
| A．at once | B．at present |
| C．at the end | D．at first |
The government declared that it would __________ an end to some unfair policies the next month.
| A．make | B．bring. |
| C．take | D．come |
_________ last term we had finished our experiments.
| A．At the end of | B．By the end of |
| C．In the end of | D．At an end |
It's surprising that your brother __________ Russian so quickly-he hasn't lived there very long.
A. picked upB. looked up
C put on D.made up