One third of the country __________ covered with trees and the majority of the citizens __________ black people.
As you are now a member of our society we shall let you ____ our secrets.
__ many times, but she still didn't know how to do it.
Scientists think that the continents ____ always where they ___today.
--- Would you tell me ___ you want your tea, with sugar or milk? --- Sugar, please.
Leaves are found on all kinds of trees, but they differ greatly __ size and shape.