Is .............. the most serious problem? A. pollution B. polluted C. pollute D. pollutant

We are looking for types of vehicles that help us to avoid ..... A. traffic B. traffic jams C. rush hours D. walking

I think we........ have electricity taxis very soon. A. may B. might C. will D. would

With the Segway, the driver pulls the handle to go back or pushes it to go........ A. forward B. backward C. round D. fly

We believe that urban transport pods can travel.... around 30kph. A. with B. at C. in D. on

We will use more... energy in the future. A. solar B. sunny C. sun D. sunlight

A sky safety ystem can help cars to........... traffic jams and crashes. A. prevent B. have C. use D. take

With teleportation, you disappear at a place, and then ............ in another seconds later. A. appears B. appeared C. reappear D. reappears

A jet pack doesn't....... a lot pf space. A. have B. bring C. take D. occur

It will be ............ to ride a jet pack in bad weather because it doesn't have a roof. A. enjoyable B. pleasant C. unpleasant D. comfortable

Skycycling tubes will be easy ......A. drive B. to drive C. ride D. to ride

Do you think the ..... price will increase next month? A. fossil fuels B. gases C. fuel D. natural gases