--Hello, Maria! Could you go shopping with me right now?

--_______. I have to stay here to finish my washing.

A. I think so B. I’m afraid so C. I hope so D. I’m afraid not

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C

Indian scientists have designed a new device* that they hope will solve one of the biggest problems with the use of solar energy. They call the device a solar tree. Solar trees have metal “branches*” which are just from a tall pole at different levels. Each branch holds a solar panel*. These panels have large metal boards that collect energy from the sun and turn it into electricity.

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