根据短文内容，完成下面的任务。
What would you do if you had $76 billion? Bill Gates was happy to give a third of it away to 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. Two years later he started Microsoft. For 11 years, Bill has been the
world's richest man.
This year, he again came top with $76 billion. But he is giving away $28 billion to help others. "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)The world's health is a lot 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 would 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."
1. 将(A)处的句子改为同义句(每空一词)：______ ______ ______ ______ 20, he left university.
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 company to us
B. let us know something about charity
C. tell us who is the richest person in the world
D. praise Bill for his help to the poor people