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Now listen and answer the questions.

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Bicycles, or bikes, are a great invention for getting around.

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Human energy makes the wheels go round and moves you along the road.

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This is faster than walking, and it's economical and eco-friendly too.

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But do you ever get tired?

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If the answer is yes, you need a solar-powered bike.

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It has lots of small solar panels that use energy from the sun to power a small motor on the back wheel.

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So when you are tired or going up a steep hill, you can just press a button and take your feet off the pedals and the bike keeps going.

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The good news, it works on a cloudy day

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The bad news, it's not in the shops yet