One-third of the country ______ covered with trees and the majority of the citizens ______ black people.

While the government says there is a(n) ________supply of houses, prices of apartments have been going up these years.[ ]

下列各组中，加点字的用法和意义相同的一项是

Students are always interested in findingout _______ they can go with a new teacher

There is somebody at the door. ________it be Tom— No, it _______ be him. It’s just sixo’clock. It’s too early.