One third of the country __________ covered with trees and the majority of the citizens __________ black people.
Plastic and rubber won’t _________ electricity,but copper will.
________ no need for everybody to discuss the problem again since it has already been solved.
I didn't like aunt Lucy,who __________ without warning and bringing us presents.
You'd better get all the work _________ before you leave.
At midnight the enemy attacked _________.