Choose the best answer.

Scientists are trying to make home electric gadgets more ______.

Choose the best answer.

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

Find the mistake.

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

Choose the best answer.

Do you think flying cars will ______ the roads safer?

Choose the best answer.

Drone ______ will be faster and cheaper for customers.

Choose the best answer.

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

Choose the best answer.

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

Choose the best answer.

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