题目内容：

73). We are all busy talking about and using the Internet. But how many of us know the history of the Internet?

     At first the Internet was only used by the government . _____But in the early_____s , universities, hospitals and banks are allowed to use it , too__ However, computers were still very expensive and the Internet was difficult to use. By the start of the 1990s, computers became cheaper and easier to use. Scientists had also developed software that made “surfing” the Internet more convenient.

    ____Today it is easy to use the Internet and sending e-mail is more and more popular among students.

      The Internet has now become one of the most important parts of people’s life.

1._____________________________________________________________________________

2._____________________________________________________________________________

3._____________________________________________________________________________