Bill Gates __36___   on October 28, 1955. He grew up in Seattle, Washington. He was a very   ___37___  boy. His favorite subjects at school were science and maths.  ___38___  he was 13 years old, Bill started to play with computers. At that time, computers ___39___  very large machines. Once(一度) he was very interested  __40___ a very old computer. He and some of his friends __41____ lots of time doing unusual things with it. In the end, they worked .out a software program (软件程) with the old machine. Bill ___42__  it for $ 4200 when he was only 17.
In 1973, Bill ___43___    Harvard University(哈弗大学). In his third year, he left Harvard to work for a company(公司) called Microsoft. Bill began his company in 1975  __44____  his friend Paul Allen. They thought the computer would come into every office and every home soon. So they began developing( 开发)the software for personal（个人的） computers: They improved (改进)the software to __45____  it easier for people to use computers.