A、A gun attack happened to her husband and son. B、Her son was paralyzed in a car accident. C、America was plagued by gun-related

At one time, Carolyn McCarthy’s world focused on the town, where she lived with her husband and son and she was, in her own words, an "average person" and "one of the quietest people you’d ever meet. "
    The incident that changed her life forever took place on the day when a gunman opened fire in a car packed with commuters on their way home from work. (29) By the time the shooting was stopped, six people were fatally wounded one of them McCarthy’s husband. Her son, also on the train, was partially paralyzed for life.
    As McCarthy wrestled with her grief and anger, she swore (30) she would do something to help stop America’s plague of gun-related violence. She began talking to anyone who would listen and started working with gun control organizations. In the process, she found herself addressing citizens’ groups all across Long Island. As people started listening, she had to adapt her conversational abilities to larger audiences and more formal speaking situations. The spontaneous give-and-take of conversation evolved into structural public speeches.
    When the U. S. Congressman in McCarthy’s district voted to repeal the federal ban on assault weapons, McCarthy took her speechmaking to a new level and she announced her candidacy for Congress. (31) Her great challenge came five months later, when she addressed a national television audience in Chicago.
    Fired by the belief, McCarthy spoke movingly about her journey into politics and about the toll that gun violence takes in American society. (32) Often addressing several audiences a day, she communicated her ideas so effectively that she was elected to the US Congress by a comfortable margin.
29．What changed McCarthy’s life?
30.What were McCarthy’s speeches about?
31.What was McCarthy’s great challenge after she announced her candidacy for Cogress?
32.Why was McCarthy elected to the US Congress?