life，use，they，become，send，person，control，that，safe，with

Since computers were invented in the USA in the 1950s，they have76.1.very important in many areas of work and leisure.There is no doubt that computers are very 77.2.in the technology and business.In space，computers have been used to control the speed and direction of a spaceship.78.3.the help of computers，doctors can find diseases easily and solve other problems.For example，tiny computers which are inside patients' bodies can keep 79.4.hearts beating normally.In factories，robots are 80.5.by computers that are like human brains.They can do work 81.6.is dangerous to humans.In business，computers are used to place and cancel orders.They are also making the workplace 82.7.and better.

Since the Internet came into being，people's 83.8.at home have been changed，too.More and more people have 84.9.computers that are used to play games and watch movies.Thanks to the Internet，people can do shopping and do business at home.Instead of writing letters on paper,people communicate by 85.10.e?mails and chatting online.The whole world is connected.The Internet is making the world smaller，like a village.

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