______books aren’t old.______ are new.

Do you mind telling us something about this area?— Not at all. ________ of the land in this area _________ covered with trees and grass.

Do you have enough students to clean the laboratory? –No, I think we need____________ students.

The excellent teacher always has a good way ______ making his class_____.[ ]

“Drive-ins” have large parking lots ______ customers are served in their cars by waitresses.