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21. The air in many big cities has become _______________ A. peaceful                            B. noisy                        C. polluted                     D. quiet 22. They will live in __________houses in the future. A. hi-tech                                         B. paper                        C. water                        D. ocean 23. We can reuse __________ A. water                                  B. air                            C. bottles                   D. iron 24. We shouldn’t __________rubbish on the street. A. throw                                              B. wrap                       C. turn off                  D. take 25. Turn __________the lights when we go out. A. on                                                 B. off                           C. of                            D. out 26. Planting more __________to reduce pollution. A. rice                                                 B. flowers                  C. trees                       D. houses 27. Walking to school will help __________air pollution. A. reduce                               B. reuse                         C. recycle                        D. refill 28. Which one is different? A. running                              B. during                         C. swimming                  D. fishing 29. I think “Tom and Jerry is the best ______________      “          A. film                                     B. sport                        C. newsreel                    D. cartoon 30. My house is ______________to the supermarket.                  A. to the left                           B. behind                        C. near                        D. next 31. Karate is a form of martial ___________                  A. fighting                              B. skill                              C. sports             D. arts 32. This small ___________ is used to play table tennis.            A. racket                                 B. stick                        C. bat                          D. hoop 33. The news programme attracts millions of  __________ at 7 p.m. A. newsreaders             B. weatherman            C. MC                          D. viewers 40. It is a good idea to __________ our clothes with our friends or cousins. A. Change                              B. Swap                         C. Turn                         D. Send 41. If people turn off all electric appliances in one hour all over the world, they can save a lots of __________ . A. Electric                               B. Electrical                    C. Electrician                  D. electricity 42. Don’t throw rubbish into the river because you will make it __________ A. Greener                             B. Dirty                         C. Cleaner                       D. Fresher 43. If there is a rubbish bin in every class, the classroom will become______ A. Harmful                             B. Lighter                        C. Dirtier                         D. Cleaner 44. Reduce, reuse, recycle is said to encourage people to waste less, by using less and using things again, in order to __________ the environment. A. Harm                                  B. Damage                      C. Pollute                        D. Protect 45. These three Rs __________ reduce, reuse and recycle. A. Stand up                            B. Stand for                   C. Ask for                   D. Means Giúp mk vs hứa 5 sao