A. root B. source C. origin D. strong
12. We are trying to replace _______ energy in our daily life.
A. renewable B. renew C. non-renew D. non-renewable
13. People can convert solar power into _________
A. food B. electricity C. heat D. warmth
14. There are many ______ power plants in this area.
A. liquid B. land C. hydro D. water
15. Look! The train___________
A. come B. is coming C. am coming D. are coming
16. Can you be quieter? I ___________to concentrate
A. am trying B. try C. is trying D. are trying
17. He __________a motorcycle to the centre now.
A. rides B. ride C. is riding D. are riding
18. We ___________a project of science at present.
A. is doing B. are doing C. do D. does
19. Please don't make so much noise. The baby ___________in the room.
A. sleep B. am sleeping C. is sleeping D. are sleeping
20. My classmates ___________football in the playground at the moment.
A. am playing B. is playing C. playing D. are playing
21. Segway is a _______ electric vehicle.
A. one-wheeled B. two-wheeled C. three-wheeled D. four-wheeled
22. They _______ testing solar-powered ships many years ago.
A. begin B. begins C. began D. beginning
23. A sky safety system will help everyone _______ traffic jams.
A. stop B. affect C. avoid D. get
24. You won't have to worry _______ bad weather when you travel in hyperloops.
A. about B. for C. on D. in
25. Electric cars don't pollute the environment because they don't have _______.
A. roof B. wheels C. pedals D. fumes
26. We _______ probably travel to the Moon in twenty years.
A. do B. did C. are D. will
27. We _______ know our exam results in two days.
A. be B. did C. will D. do
28. People _______ much faster thanks to super cars in ten years.
A. travel B. travels C. will travel D. travelled
29. I'm afraid I _______ able to attend your workshop tomorrow.
A. won't be B. isn't C. wasn't D. weren't
30. My uncle often _______ us on Tet holidays.
A. will visit B. is visiting C. visits D. visited
31. We _______ driverless cars in the future.
A. will have soon B. soon will have C. have soon D. will soon have
32. People _______ with wheels and wings.
A. perhaps will equip B. will perhaps equip C. will equip perhaps D. equip will perhaps
33. I don't think she _______ the final test.
A. pass B. will pass C. passes D. is passing
34. They _______ a new autopilot model in the last meeting.
A. introduced B. introduce C. are introducing D. will introduce
35. I think solar-powered _______ the environment
A. won't pollute B. don't pollute C. didn't pollute D. aren't polluting
36. My father _______ an electric car next month.
A. bought B. buys C. is buying D. will buy
37. Electric cars are more _______ than petrol cars.
A. economic B. smarter C. eco-friendly D. friendly