—           , He learnt it by himself.

All computers will  numerous databases through high-speed data networks.

  ，she came back.

My father works in a .

    How would you use a radio or a telephone if you had no electricity or batteries? This 1bothered（使烦恼）British inventor Trevor Baylis. Then he made a wind-up（装有发条的）radio. It doesn't need2or batteries. You wind it up3 hand. It plays for about an hour. Then, you wind it up again. Today it's 4 in South Africa.

    Then in 1999, Baylis invented a mobile phone that is powered by5. The shoes contain（含有）a small battery that is powered when you 6. This battery is7 to a mobile phone. These two simple inventions can bring modern communication to all parts of the world.

    Baylis didn't have a university degree in engineering. In 8he left high school before graduating（毕业）. He just loved9 things to help people. He never knew10 ideas would come to him. The idea for the telephone came to him in a dream.

—Yes.