21. You can send and receive e-mails from a ____.
A. charger B. printer C. smartphone D. USB
22. The ____,which can travel underwater, is very useful for scientists to learn about the undersea world.
A. aeroplane B. electronic car C. spaceship D. submarine
23. Like Vietnamese, Thai people also depend ____ water for their crops.
A. against B. for C. in D. on
24. In 1999, the king’s Chaipattana Aerator obtained Thai ____ for his rain-making techniques.
A. certificates B. charters C. licenses D. patents
25. Paddle-wheel machine helps to clean the wastewater before ____ it for farming.
A. rearranging B. recycling C. reducing D. reusing
26. You can get access ____ the Interne, via a range of devices such as desktop or laptop computers, mobile phones, and tablets.
A. for B. in C. of D. to
27. Thomas Edison, Benjamin Franklin, James Watt are among of the greatest ____ of all time.
A. inventions B. inventiveness C. inventors D. invents
28. _____ noodles are a precooked and usually dried block invented by Japanese.
A. Instantaneous B. Instance C. Instant D. Instantly
29. It is definitely true that nature has inspired ____ inventions and technologies.
A. numbers B. numeral C. numerical D. numerous
