选择方框中适当的单词填空。

surprised, millions, easier, history, whole, difficult, popular, working, expensive, different

We are all busy talking  about and using the Internet,  but how many of us know the  1. _______ of the Internet.
Many people are 2.__________  when they find that the Internet was set up in the 1960s. At that time, computers were large and 3. _______________.  Computer networks didn't work well.  If one computer
in the network broken down, then the 4. __________ network stopped. So a new network system had to be set up.  It should be good enough to be used by many 5. _______   computers.  If one be sent through
another part.  In this ways, computer network would keep on 6.___________ all the time.
At first the Internet was only used by the government,  but in the early 1970,  universities,  hospitals and banks were allowed to use it, too. However, computers were still very expensive and the Internet was 7.________ to use. By the start of 1990s, computers software that made" surfing" the Internet 8.___________. Today it is easy to get online and it is said that 9. _______   of people use Internet every day. Sending e-mails is more and more 10._________ among young people.

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