Have you heard of John Snow in the times of Queen Victoria? John Snow________ was a famous doctor attended Queen Victoria as her personal physician. But he became inspired when he thought about helping ordinary people_______ (expose) to cholera. This was the ________(dead) disease of its day. Neither its cause ______ its cure was understood, ________ many thousands of terrified people died. John Snow realized that cholera would never________(control) until its cause was found. He began to gather the information, for which he made _______ map. He marked the exact place where the dead had lived on it . As a ______, he found out the cause of cholera and suggested the source of all water supplies be examined ________(immediate). Thanks _______him, “King Cholera” was defeated .