Mr Liu became a policeman when he was 20 years old

Mr Liu became a policeman when he was 20 years old he became a piaon champion when he was ten years old 改为同义句 He became a college student when he was 18 years old(改为同义句） he became a dancer when he was 25 years old（改为同义句） How old was he when he became a player?怎么回答?是：When he was 20 mary became a movie star when she was three years old 对when she became a movie star when she was three years old的同义句 She became a movie star when she was six years old.改为同义句 求一篇 英语阅读理解 开头是When I was 13 years old, l became a vegetarian When he was only twelve years old ,he was already a skating Jody was ten years old when he decided he needed a job.He th Jody was ten years old when he decided he needed a job. He t