Had they known what was coming next, they _________second thoughts.
| A．may have | B．could have |
| C．must have had | D．might have had |
As a result of the destruction of the forest, a large ________ of animals ________ lost their living places.
| A．number; has | B．amount; has |
| C．number; have | D．quantity; have |
One third of the country________covered with trees and the majority of the citizens________black people.
| A．is; are | B．is; is |
| C．are; are | D．are; is |
________of the land in that district________covered with trees and grass.
| A．Two fifth；is | B．Two fifth；are |
| C．Two fifths；is | D．Two fifths；are |
________of the people on the Net ________China's economy is among the strongest in the world.
| A．Four fifth; believes | B．Four fifth; believe |
| C．Four fifths; believe | D．Four fifths; believes |
Nobody but doctors or nurses and those ________ by Dr. Hu
________ to enter the patient's room.
| A．invited；is allowed |
| B．are invited；are allowed |
| C．being invited；allowed |
| D．invited；are allowed |