听第二段独白,完成小题。
Li Wen is a 16-year-old boy. He works hard and does well in school. It is hard to believe that he used to have much 16 in school. His parents moved to the city to look for jobs, so they couldn't be at home to look 17 him. From then on, he became less interested in school. Then his parents made a 18 to send him to a boarding school. One day he told his teacher he wanted to leave school. His teacher called his parents and 19 them to come back and talk with their son. This conversation changed his life. He realized that his parents would always love him and be 20 of him. Now he is much happier and more outgoing than he used to be.