Swee Lin has an interesting hobby . She collects stamps. She spends a lot of time on her stamp collection  after school hours. She has collected hundreds of stamps from all over the world. They are all in color. Swee Lin likes stamps with pictures of animals and birds on them. In this way, she learns the names of many animals and birds. She also borrows books on animals and birds from her school library. She learns many things about them. Sometimes Swee Lin has many stamps of the same kind. She gives them to her friends. They give her other stamps in return. Swee Lin writes to her friends in many countries. She sends them stamps of her country. In return, they send her stamps of their countries. Swee Lin's father also gives her stamps. He brings them home from his office for her. Many of Swee Lin's friends collect other things. Some collect coins  and others collect matchboxes . But, all of them say that Swee Lin's collection is the most interesting of all. Sometimes Swee Lin has many stamps of the same kind. She  _  .
keeps them throws them away sells them to her friends sends them to her friends