11. Smartphone can be a great learning ____ but you need to think of how to use it effectively.
A. benefit B. choice C. invention D. tool
12. It is convenient for you to read ____ when you travel.
A. e-books B. laptops C. online game D. smartphones
13. Many young people carry a pair of earbuds as they are small, light, and ____.
A. chargeable B. economical C. portable D. transferable
14. Washing machine or vacuum cleaner can help you to ____ time while doing housework.
A. kill B. save C. spend D. waste
15. Velcro has gradually become a familiar ____ for shoes, jackets, and even spacesuits.
A. button B. fastener C. locker D. zipper
16. Most smartphones now ____ flash player as well as voice and video calls.
A. display B. offer C. provide D. support
17. Many students prefer ____ assignments on their laptops to writing traditionally.
A. reading B. searching C. sending D. typing
18. Mobile devices such as laptops or digital cameras can be charged by ____.
A. solar charges B. solar-charges C. solar chargers D. solar-chargers
19. We can surf the ____ to search for news, watch films, or download music.
A. e-book B. internet C. laptop D. smartphone
20. In many classrooms, teachers use chalk to write on the ____.
A. blackboards B. black boards C. whiteboards D. white boards
