Today computers come ____(1)___ all shapes and sizes.There were still big computers for companies or universities. There are other special computers for factories. These large computers tell the fatory machines ___(2)___ to do. But there are also small ___(3)___ computers to use at home or in an office. There are even computers in telephones, television ___(4)___, and cars. These computers have to be small. They are so small that you cannot ___(5)___ see all their parts. Computers are very useful, but they also can ____(6)___ problems. One kind of problems is with the computer's memory. It is not perfect so sometimes computers ___(7)___ important information. Another problem is with the machinery. Computers are machines, and machines can break down. When the computers break down, they may ___(8)___ information, ___(9)___ chalk on a blackboard. Or they may stop doing anything at all. And there is ___(10)____ different kind of problem with computers. Some doctors say they may be bad for your health. They say you should not work with computers all day.