làm nhanh giúp ak 9. A. reduce B. replace C. reuse D. recycle 10. A. noisy B. costly C. useful D. expensive 11. A. goggles B. courts C. skis D. skateb

làm nhanh giúp ak
9. A. reduce B. replace C. reuse D. recycle
10. A. noisy B. costly C. useful D. expensive
11. A. goggles B. courts C. skis D. skateboards
12. ________ robots can help to teach children in the classroom, they will never replace teachers.
A. When B. Although C. Because D. If
13. „Will robots be more and more expensive?‟ „_______ Prices will become cheaper over time.‟
A. Not at all. B. Sure. C. Sounds great! D. I think so.
14. If more people cycle, there will be __________ air pollution.
A. much B. more C. less D. little
15. People ________ on Mars someday, but it is too expensive to travel there now.
A. live B. are living C. will live D. have lived
16. ________ up the tree! You‟ll fall down.
A. Climb B. Climbing C. Not to climb D. Don‟t climb
17. _________ does Sam watch the “Muppet Show”? – On every Sunday afternoon.
A. What B. When C. What time D. How often
18. If they __________ do their homework, their teacher will punish them.
A. do B. do not C. did D. won‟t
19. It was so noisy that we _______ hear ourselves speak.
A. can B. mustn‟t C. could D. couldn‟t
20. The Statue of Liberty is one of the most famous ___________ in the United States.
A. towers B. landmarks C. capitals D. cities