One-third of the country____ covered with trees and the majority of the citizens______ black people.

—_____________ do you visit your grandparents?—Twice a month.

---You could have walked here.---Yes. A taxi ___________ necessary.

Jane and I ____ twelve. My sister ____ ten.

.John is the only one of the students in the class that never______ a mistake even when it is pointed to him.