Unit 13We are trying to save the earth.Review1.努力去做某事2.手机3.垃圾,废物4.河底5.充满6.渔民7.政府8.把垃圾扔到河里9.要求某人干某事10.关闭工厂11.打扫12.过去常常13.在中起作用，在中扮演角色 try to do mobile phones litter;rubbish;waste the bottom of the riverbe full of fishermangovernment throw rubbish into the river ask sb.to do sth.close down the factories clean up used to be play a part in 1.骑自行车2.骑自行车有别的好处。3.对.有益4.垃圾污染5.去购物6.开始做某事7.记得要把垃圾扔进垃圾桶8.保持公共场所的整洁和美丽9.对.有影响、有作用10.通向美好未来1.ride the bike2.There are other advantages of bike riding.3.be good for4
