Đáp án đúng: Giải chi tiết:My hobby is collecting books. My book collection started when I was 7 years old. At that time, my mother used to give me money to buy a book whenever I got good marks, which interested me a lot as I loved reading . Since then, I have collected books as a hobby. My father knew that and he helped me a lot. To increase the size of my collection, I sometimes exchange books with my friends who have the same hobby with me. I also try my best to get high grades to get money from my mother for books. Now I have over 300 books which are classified into different kinds like romantic novels, science fiction stories, picture stories...Every time I look at my collection, I feel proud of it and I intend to donate all the books for the children in remote areas in the future.