Choose the correct answer to each of the following questions.

3. 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

4. Social media is an essential tool in a

world.

A. digital

B. electric

C. undeveloped

D. portable

5. occurs when the earth's atmosphere traps certain gases such as carbon dioxide as well as water

vapor.

A. Pollution

B. Greenhouse effect

C. Global warming

D. Depletion

6. We can use our laptop to

the Internet, download applications which is useful for learning.

A. access

B. take

C. select

D. impact

7. Letting students use their own digital devices in class can improve the experience in many ways.

A. educated

B. educational

C. uneducated D. educator

8. Personal devices are useful for learning.

A. electric

B. electrical

C. electronic

D. electronically

9. Fossil fuels which are non-renewable pollute the air and cause air A. pollution

B. solution

C. contaminate D. consumption

10. A

forest is a forest where trees that are cut are replanted and the wildlife is protected.

A. biological

B. ecology

C. tropical

D. sustainable

11. She is talking about the author_ book is one of the best-sellers this year.

A. which

B. whose

C. that

D. who

12. Do you know the boy

we met at the party last week?

A. which

B. whose

C. where

D. whom

13. The Korean are than the American in addressing their bosses.

A. more formal

B. formal

C. most formal D. the most formal

14. The book which I bought yesterday was

than I was expecting.

A. cheap

B. cheaper

C. cheapest

D. more cheap