_____ of the students who took part in the military training is 450.
| A．A number | B．A lot | C．Lots | D．The number |
The environmentalists said wild goats’ __________ on the vast grasslands was a good indication of the better environment.
| A．escape | B．absence | C．attendance | D．appearance |
In dealing with public relations,we should make every effort to prevent the __________ in personality.
| A．contact | B．contrast | C．connection | D．conflict |
We __________ Mr.Cox to be a fine professor.
| A．accept | B．know | C．think | D．regard |
At the __________ of the gun,the runners dashed from their starting points.
| A．sight | B．hearing | C．sound | D．shot |
Mr.Smith used to smoke __________ but he has given it up.
| A．seriously | B．heavily | C．badly | D．hardly |