题目内容：

What would you do if you had $76 billion? Bill Gates was happy to give a third of it away to the charity. He spends at least $1.2 billion every year helping the poor.

Bill is the richest, and also the most generous man in the world. He was born on October 28, 1955.(A) When__he__was__20,__he__left__university__and__started__Microsoft. For 11 years, Bill has been the world's richest man.

“I'll give my money back to the world，” said the rich man. “Many people still need medicine and care to become healthier.”

Bill loves helping others just as he loves computers. He always says “super” when he talks about making people's health better. “(B)Solving__the__world's__health__problem_ _is__like__solving__computer__problems. You get smart people together. You take it on because there has never been an answer before，” he said. If you ask him why he likes giving away his money, he will turn his head and say, “It's because of my mum. She asked me to do (C) it years ago when I was just a small boss.”

根据短文内容，完成下面的任务。

1.将(A)处的句子改为同义句(每空一词)：

________ ________ ________ ________ 20, he left university and started Microsoft.

2.将(B)处的句子译成汉语： ________________________________________________________________________

3.(C)处的it指的是(用英文回答，不超过5个词)

________________________________________________________________

4.回答问题：When did Bill Gates start Microsoft?

__________________________________________________________________

5.单项选择：The writer of the passage wants to ________.

A. introduce Microsoft to us

B. let us know something about the charity

C. tell us who is the richest person in the world

D. praise Bill for his help to the poor  people