Question

一道语法填空疑问

In the United States, there were 222 people 1___ed______ （report） to be billionaires（亿万富翁） in 2003. The 2________ of高考资源网 these is Bill Gates, worth at least $ 41 billion, who made his money 3______by____ starting the company Microsoft. Mr. Gates was only 21 years old 4_____when____ he first helped to set 5_______up__ the company in 1976. He was a billionaire by the time he was 31. w.w.w.k.s.5.u.c.o.m
6______However___, there are still some other people who have made lots of money at even 7___younger______ （young） ages. Other young people who have struck it rich include Jackie Coogan and Shirley Temple. 8________ of these child actors made over a million dollars 9_____acting____ （act） in movies before they were 14. But the youngest billionaire is Albert von Thurn und Taxis of Germany, 10____who_____ inherited （继承） a billion dollars when he turned 18 in 2001!

第2个空为什么不填top,第八个空为什么不填some
请高手解释一下，答案2：richest 答案8：both

Answer 1

空格后是of 而 richest 是比较级
两类人 呼应上文的 some…… other……
做完形填空要注意上下文和时态