20. When the cat saw the dog, it stopped in __________ tracks. A. my B. its C. his D. hers 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 getting more and more__________. A. expensive 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-wheel 40. With the Segway, the driver pulls the handle to go back or pushes it to go. A. forward B. backward C. round D. fly 41. __________ books are here. __________ are there. A. Theirs – ours B. Their – our C. Theirs – our D. Their – ours 42. __________ is a single-wheel bike. A. Mono wheel B. Hover scooter C. Segway D. Teleporter 43. Choose the word having different stress from the others. A. harvest B. parade C. music D. pumpkin 44. __________ the film was gripping, Tom slept from beginning to end. A. Therefore B. Despite C. However D. Although 45. You should look right and left when you go __________ the road. A. down B. across C. up D. along 46. You found the plot of the film __________ A. boring B. bored C. interested D. acting 47. A lot of dancers go to Rio de Janeiro to __________ the Carnival. A. attend B. join C. perform D. appear 48. Nuclear power __________ in the future. A. will replace B. replaced C. will be replacedD. replaces 49. Wind, hydro and solar are __________ resources. A. modern B. renewable C. non-renewable D. new 50. It’s really difficult to __________ a bicycle up the hill. A. fly B. drive C. pedal D. sail