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In the future, plastic bags ______ in environmentally friendly cities.

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

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The kinds of fossil fuel that cause pollution probable won’t be common in the future.

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Do you think flying cars will ______ the roads safer?

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Drone ______ will be faster and cheaper for customers.

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______ fossil fuels for transportation and home energy increases greenhouse gases, which makes the globe warmer.

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

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