The girl was listened _______in the next room when I came back last night.
| A．to singing |
| B．to sing |
| C．singing |
| D．sang |
The limited supply of water has been put into practice, take care to turn off the running ____ before you leave.
| A．radio | B．traffic lights | C．gas | D．tap |
The bank is equipped with new alarm _____. We can say it's safe and reliable completely.
| A．system | B．way | C．order | D．setting |
A_____ has taught us what atoms are made up of and how powerful the atom bomb is.
| A．seaman | B．salesman | C．naturalist | D．scientist |
After work, the young man and his colleagues went to the nearest _____ and sat down at the table for a grand dinner.
| A．bar | B．cafe | C．restaurant | D．dining-room |
It is widely believed that a good _____ between the two countries is important for the development of both China and the USA.
A. connection B. link C. relation D. relationship