Happiness is【21】everyone looks for. Maybe someone says that he is【22】. However, what makes him happy may not【23】for Others. And even worse, someone may spend all his【24】looking for happiness, but in vain(徒然). In the past, I tried my best to【25】myself happy. I thought if I could freely get and do what I wanted to, I【26】be happy. Certainly, it was possible but I was【27】Though I could be happy at times, I couldn't keep my happiness for a long time. Why? One day, when I told a friend of mine what I【28】about happiness, he smiled and said only a few words, 'Happiness is not a single thing but a by- product(副产品).' I was surprised, but he was really【29】 Someone thinks money can【30】everything, but when he becomes a millionaire after his work, perhaps he【31】find that he has new【32】. And he has to go to church for【33】. Sometimes love can bring happiness,【34】at other times it【35】misunderstanding, tiredness, and even quarrelling. Happiness is only a by-product of all【36】of things you love to do. You can not grasp it in a【37】way. That is, it is not a thing existing in material form. but in your senses. You should tell yourself, 'I do not【38】whether I'm happy or not. But I must love my life.' And one day you will suddenly find happiness【39】has quietly【40】. (41)