One third of the country________covered with trees and the majority of the citizens________black people. 

Eating a lot of _____ and vegetables  ______ for your health.

Jack, together with his sisters,_____ great interest in writing these days. 

While a huge amount of money ___been spent stopping pollution , large quantities of water_    _still heavily polluted．

—Is there anybody in the classroom ?—No, the teacher, together with the students _____ to the playground.