Mr. Wang loves c      stamps. It not only brings him h      but also know him know a lot about history. Last year he    （买）    a set of four stamps to remember the great book Master Sun’s Art of War. This book is one of the e       and the most important military (军事的) books in the world. The book is          useful and important that it’s known by many other countries in the world. The face values(面值) of the     were 20，30，60 fen and one yuan, but Mr. Wang spent about 2,000 yuan     them. He often      the fun of collecting stamps with his friends. He says,“I am very happy    I’m looking at my stamps. They let me know more about the history of our country and make more    .”