we must save the trees and not buy things made of ivory意思

反义疑问句习题We must save the Earth.We must save the Earth,______,_______? 改反意疑问句We must save the Earth.We must save the Earth,___ ___? we must save the ___________animals in the world（danger） 请问“we must help save the earth”中的help The animals are in d_ .We must save them. we must do what we could___(save) the person who is in need we must save our earth作文 This year we must strive to make money ,save money ,fight for the future we must save the trees and not buy things made of ivory we must save the trees and not buy things made of ivory意思 改错题：we should keep in mind the necessity that every person must save the energy resources.we should keep in mind the necessity that every person must save the energy resources为什么要把must改成should? save ,the,we,trees ,must,ivory,made of,thingssave ,the,we,trees ,must,ivory,made of,things,not ,buy,and（连词成句） we must wear_______(save)belt in a car we must call the We must purify the 句型：We must save the trees and not buy things made of ivory.为什么buy前用了not,而不是don‘t ,made用过去式? 单项选择； Every one of us must know:( )we live can we save the earth.A.by changing the way only B.only by changing the wayC.by only changing the way D.by changing only the way we must o______ the rules