--It is really fun to hike and I often go hiking in the forest.
--But hiking alone in the forest ______ be very dangerous.
| A．can | B．must | C．shall | D．will |
As a result of destroying the forests, a large __________ of desert __________ covered the land.
| A．number; has | B．quantity; has |
| C．number; have | D．quantity; have |
__________ of the land in that district __________ covered with trees and grass.
| A．Two fifths; is | B．Two fifth; are |
| C．Two fifth; is | D．Two fifths; are |
Every boy and every girl as well as some teachers who __________ to visit the museum __________ asked to be at the school gate before 6:00 in the morning.
| A．are; are | B．is; is |
| C．is; are | D．are; is |
More than one student __________ absent. The number of students present __________56.
| A．are; is | B．is; are |
| C．is; is | D．are; are |
Large quantities of water, as well as some other timely help，__________ since the serious drought hit Yunnan Province.
| A．has offered | B．have offered |
| C．have been offered | D．has been offered |