请把下面句子改成写被动语态的句子。
1. People designed the first computer in the 1940s.
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2. Computers solve a lot of problems for us.
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3. Most schools in China teach Computer.
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4. People order a lot of things on the Internet now.
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5. At present people use computers as a tool.
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6. A computer stores much information.
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7. People didn't use computers widely 50 years ago.
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8. I didn't know who designed the first computer.
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9. Everyday people use computers.
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10. The school bought many computers yesterday.
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