短文填词 根据短文内容和以下提示：1）首字母提示，2）语境提示，3）汉语提示，在每个空格内填入一个适当的英语单词。所填单词要求意义准确，拼写正确。
Many useful machines were invented by inventors. These machines have c  ____ the world a lot. There are many great in the world, and Watt(瓦特) was one of them.
　Watt was English. When he was a child, he liked to ask questions and he was always .______(学习)hard. One day, he was sitting in the kitchen with his grandmother, she _ ___（放）a kettle (水壶) on the stove (火炉). Soon steam (蒸汽) began to come        the kettle and the lid (盖子) was shaking. Watt asked what was in the kettle. His grandmother said, "Water, my child."
　"But I know there's s _____in it. It pushes the lid up." said Watt. His grandmother told him that it was only steam. He asked his grandmother,"W  __ does the steam come up under the lid?" His grandmother said that it came from hot water. Watt said to ____（他自己）,"The steam is so strong ______it can push things. The steam will be much_____ if there's more water."
　　Later, Watt tried hard and made steam work for people. He invented the first engine.