The most important thing about cotton in history is __ part that it played in __ Industrial Revolution.
Suddenly the idea came to me _______ I might turn to my teacher for help.
Since the man had no choice but to fight back, we’d better _________ him.
Animals are obviously _____ lower form of life than _____man.
Hurry up! Mark and Carol _______ us.
—Bad luck. I scored rather low in the test. — . Or you'll have to leave school.