A professor and a writer _________present at the meeting.

 In our school there ______ a number of books on science and the number of them ______ growing larger and larger.

______ they grow they make sure that what is left in the ground after harvesting______ a natural fertilizer for the next year’s crop.

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

From the city to its satellite town _____ only less than one hundred miles.