阅读下面材料，在空白处填入适当的内容（不多于3个单词）或括号内单词的正确形式。
Almost everyone has some kind of hobby.   may be anything from collecting stamps to making model planes. Some hobbies are very expensive, but      are valuable only to their owners. I know a man who has a coin collection worth several thousand dollars. A short time ago he bought a seldom       (see) fifty-cent piece worth $250! He was very happy about what he bought and thought the price was     (reason).     the other hand my youngest brother collects match boxes. He has almost 600 of them but I doubt      they are worth any money. However, to my brother they are very valuable. Nothing makes him      (happy) than to find a new match box for his collection. That’s  a hobby means, I guess. It is something we like to do in our spare time simply     the fun of it. The value in dollars is not important, but the     (pleased) it gives is.