题目内容：

Mr Wang loves collecting stamps(集邮)very much. They can bring him happiness and   1. .him know a lot about history. Last year he   2. .four stamps to remember the great book Master Sun’s Art of War .This book is one of the earliest and the most   3. .books in the world. Mr Wang spent about 2,000yuan   4. them. He often    5. . collecing stamps with his friends .