21. I think we__________ have electric taxis very soon.
A. may B. might C. will D. would
22. With teleportation, you disappear at a place, and then__________ in another place seconds later.
A. appears B. appeared C. reappear D. reappears
23. Every day over1,000 new cars add to the city and the city of over 20 million people is ge B. famous C. difficult D. gridlocked
24. My brother and I often come to school__________ foot.
A. at B. in C. by D. on
25. Skycycling tubes will be easy__________.
A. drive B. to drive C. ride D. to ride
26. The white cat is Helen’s, and the black cat is__________.
A. my B. I C. mine D. of mine
27. We try to make the future green by using vehicles or kinds of energy that are__________.
A. environmentally friendly B. environment friendly
C. environmentally friendship D. environmental friendly
28. This is Linda’s hat, and those shoes are__________, too.
A. her B. hers C. our D. their
29. 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
30. A sky safety system can help cars to__________ traffic jams and crashes.
A. prevent B. have C. use D. take
31. People won’t use flying cars__________ the year 2050.
A. before B. after C. during D. until
32. Is__________ the most serious problem?
A. pollution B. polluted C. pollute D. pollutant
33. We believe that urban transport pods can travel around 30kph.
A. with B. at C. in D. on
34. Do you think the__________ price will increase next month?
A. fossil fuels B. gases C. fuel D. natural gases
35. We will use more__________ energy in the future.
A. solar B. sunny C. sun D. sunlight
36. A jet pack doesn’t__________ a lot of space.
A. have B. bring C. take D. occur
37. Which__________ of transport do you think will be used in the future?
A. mean B. meaning C. meanings D. means
38. We are looking for types of vehicles that help us to avoid .
A. traffic B. traffic jams C. rush hours D. walking
39. The Segway, which is a__________ vehicle, will be a success.
A. two-wheels B. two wheels C. two wheel D. two-wheeletting more and more__________.
A. expensiv
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