Theearthisourhome.Wemusttakecareofit.Lifetodayiseasierthanitwashundredsofyearsago,butit(61)__(bring)somenewproblems.Oneofthebiggestproblemsispollution.Wecanseeit,smellitandevenhearit.Man(62)________(pollute)theearth.Themorepeople,themorepollution.Manyyearsago,theproblem(63)___(benot)soseriousbecausetherewerenotsomanypeople.Whentheland(64)_____(use)uportheriverwasnotcleaninaplace,manwenttoanotherplace.Nowman(65)_________(pollute)thewholeworldslowly.Airpollutionisstillthemostserious.it’sbadforlivingthingsintheworld.Manycountriesdon’tletpeople(66)(burn)somethingbadfortheairinhousesandfactories.PollutionbySO2isnowthemostdangerouskindsofairpollution.It(67)______(cause)byheavytraffic.Peoplesayit’sbest(68)___(ride)bikes.Whenyouareriding,thereisnopollution.Butevenindevelopedcountries,mostpeopledon’tgotoworkbybike.It’snotbecausebikesareexpensiveorpeoplearetirediftheyridetowork.It’sbecausethenumberofcarsontheroads(69)____(become)larger.Somorepeopleputawaytheirbikesandgotoworkbycar,thenthings(70)___(get)worseandworse.Weshouldhavespecialroadsonlyforbikesandmakeitsodifficultandexpensivefordiverstotaketheircarsintothecitythattheywillgobacktousingtheirbikes.填空答案61.hasbrought,62.haspolluted,63.wasn’t,64.wasused,65.ispolluting,66.burn,67.iscaused68.toride,69.becomes,70.aregetting补充:个人觉得69填hasbecome,70填get比较好。(我是前英语老师。)满意请及时采纳,谢。
