Choose the best answer.

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

Choose the best answer.

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

Choose the best answer.

Do you think flying cars will ______ the roads safer?

Choose the best answer.

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

Choose the best answer.

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

Choose the best answer.

I don’t think robots ______ skillful enough to keep the streets as clean as humans in the future.

Choose the best answer.

Different kinds of 3D printers ______ build houses more quickly and cheaply in the next 50 years.

Choose the best answer.

In the coming years, students ______ by robots in some modern classrooms.