阅读下面短文,根据上下文填入适当的词语,或使用括号中的词语的适当形式填空,并将答案填写在答题卡上标号的相应位置。
(1)
In the United States, there were 222 people 1_________ (report) to be billionaires(亿万富翁) in 2003. The 2_________ of these is Bill Gates, worth at least $ 41 billion, who made his money 3__________ starting the company Microsoft. Mr. Gates was only 21 years old 4_________ he first helped to set 5_________ the company in 1976. He was a billionaire by the time he was 31.