Fifty years ago computers were very big. They used a lot of energy. They were very ______ and few people could buy them. They were so ______ that many people couldn’t use it.

Now computers are becoming smaller and smaller. They are very easy ______. Scientists make them ______ to use and more and more people have computers because computers are becoming cheaper and cheaper.

Computers can do much ______ work than we humans (人类). A computer can take the place of (代替) many people. Sometimes many people need a long time to do some work, while a computer can do it in a few seconds (几秒内). So computers work very ______. Also, computers can do some ______ work that people can’t deal with (处理).

In our daily life, we can ______ ourselves by listening to music or watching movies online. We can also find some information for our work and ______. Computers make our life easier. For example, we can shop and chat face to face online. We can even ______ jobs on the Internet.