阅读下面材料，在空白处填入适当的内容（1个单词）或括号内单词的正确形式。
Louis invited his friends to lunch one day. He was cooking some delicious food in the kitchen. Suddenly, he       (find) that he had run out of salt. So Louis called to his son, “Go to the village and buy some salt, but pay a fair price for it: neither too much       too little.”
His son looked surprised. “I can understand why I shouldn’t pay too much, Father, but if I can pay less,        not save a bit of money?”
“That would be a very         (reason) thing to do in a big city, but it could destroy a small village like ours,” Louis said.
Louis’s guests,        had heard their conversation, asked why they should not buy sale more cheaply if they could. Louis replied, “The only reason why a man would sell sale        a lower price would be that he was desperate for money. And anyone who took advantage of that situation would be showing a lack of respect ____ the sweat and struggle of the man who worked very hard to produce it”
“But such a small thing couldn’t         (possible) destroy a village.”
“In the beginning, there was only        very small amount of unfairness in the world, but everyone added a little, always       (think) that it was only small and not very important, and look where we have ended up today.”