1 - The midnight sun is caused when the earth tilts toward the sun.





2 - It was inevitable that the smaller company should merge with the larger.





3 - The current edition of that magazine discusses the ancient civilizations of Latin America.





4 - The labor movement in the United States seeks to achieve economic reform within the existing free enterprise system.





5 - It was necessary to divide the movie 'Roots' into five parts in order to show it on television.