On a cold winter day, a fox ____  mother bear that he would teach her how to fish. As she____ to learn, he took her to a hole in the ice, and told her to put her tail down in the water. He told her to keep the tail there for____ .  Then____ she pulled the tail out of the water, she would find fish around the tail. The bear was foolish enough to believe____ the fox said. She sat for a long time with her tail in the water. She was ____ the fish. But when she____  to pull her tail lout of the water, she found that it was frozen in the ice. She asked the fox to pull her out. But he laughed to himself and ____ . so she called father bear to help her. Father bear came. He pulled hard and ____ got her out, but a part of her tail was in the ice. That is____ people find the bear’s tail so short.

他常说：“还不如我闺女呢，太慢了！”干了不到一年，父亲就辞去了这份工作，仍然提篮叫卖。自己____，他说，凭着____做买卖才是____，不能做____买卖。“公平买卖走正道，顾客点头说声好，回头再来这是____，做生意讲实在是____。”

某同学在做“比较不同物质吸热能力”的实验时，使用相同的电加热器给水和煤油加热，他得到如下数据：