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______ of robot cleaners, Joey bought several of them for his home.

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______ will probably be the fastest and safest means of transport to travel downtown.

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Humans ______ solar panels on the windows or rooftops of their houses.

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______ there will be more green trees than buildings in future cities.

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Do you think flying cars will ______ the roads safer?

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Scientists are trying to make home electric gadgets more ______.

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______ the damage caused by pollution, they banned cars and buses.

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Joe has some solar panels on his house rooftop. He ______ save some electricity from today.