题目内容：

Have you heard of John Snow in the times of Queen Victoria? John Snow___1._____ was a famous doctor attended Queen Victoria as her personal physician. But he became inspired when he thought about helping ordinary people___2.____ (expose) to cholera. This was the ___3._____(dead) disease of its day. Neither its cause _4._____ its cure was understood, ____5.____ many thousands of terrified people died. John Snow realized that cholera would never____6.____(control) until its cause was found. He began to gather the information, for which he made __7._____ map. He marked the exact place where the dead had lived on it . As a _8._____, he found out the cause of cholera and suggested the source of all water supplies be examined ___9._____(immediate). Thanks _10.______him, “King Cholera” was defeated .