题目内容：

Many useful machines were______by inventors.These machines have______the world a lot.There are many great inventors in the world，and Watt was one of them.

Watt was English.When he was a child，he liked to ask questions and he was always______hard.One day，he was sitting in the kitchen with his grandmother，and he______a kettle (水壶) on the oven.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______in it.It pushes the lid up，” said Watt.His grandmother told him that it was only steam.He asked his grandmother，“______does the steam come from？” His grandmother said that it came from hot water.Watt said to______，“The steam is very strong.It can push things.The steam will be much______if there's more water.”

Later，Watt tried hard and made steam______for people.He invented the first engine.

1.A. sent    B. made    C. invented    D. worked

2.A. changed    B. got    C. became    D. was

3.A. playing    B. using    C. growing    D. thinking

4.A. look at    B. looked    C. saw    D. watch

5.A. at    B. out of    C. in    D. out

6.A. something    B. nothing    C. anything    D. wind

7.A. Where    B. Why    C. Whether    D. When

8.A. him    B. herself    C. himself    D. her

9.A. stronger    B. strong    C. weak    D. weaker

10.A. working    B. worked    C. work    D. works