A. expensive B. comfortable C. depends D. owns E. by himself

When most teenagers are learning how to work out maths problems, Kelvin Doe is teaching himself to make batteries and generators（发电机）for his neighbourhood in Africa.

Kelvin is only 15 years old, but he has already created batteries and generators ______. He used the things he picked up around the house or frown litter bins to create term.

"In my hometown, we don't have much electricity and batteries are ______, "Kelvin said. So he decided to make batteries to light up people's homes.

Kelvin also ______ a radio station. He broadcasts news and plays music for the local people. The station gets its electricity from a generator also made by him.

His next project will be a windmill（风车）for electricity supply. He wants to help more families in his hometown live a happy and ______ life.

【1】________

【2】________

【3】________

【4】________