if we cut down and____ trees,we _____our best fighters against pollution.A.burn,destroyingB.burned,destoryC.burn,destoryD.burn,are destorying

连词成句cut we the trees will dirty get air the down if all shall we cut down the tree? We mustn't cut down forests 句型转化We ____ ____to cut down forests If we ——more rain forests,our planet will be in dander 空格处挑填are cutting down 还是cut down Trees are very important.We can't cut thenm down B cut it down C cut down themD cut down it Must we cut down the trees? No.we ____. cut down Cut down cut down ? if we cut down and____ trees,we _____our best fighters against pollution.A.burn,destroyingB.burned,destoryC.burn,destoryD.burn,are destorying cut off cut down区别0.We must plant more trees after we _____ every year.A.cut off them B.cut them off C.cut down them D.cut them down We should stop people from (cut)down trees. We must stop___ down trees.A.cutting B.cut in great danger,we cut down many trees every year. we mustn't cut down forests.(改为祈使句） we must ask people not to cut down trees =we must -----people -------cutting down trees. 1 .there,can,take,if,the,you,bus,to,want,go,you 21 .there,can,take,if,the,you,bus,to,want,go,you2 .cut,we,the,trees,will,dirty,get,air,the,down,if,all3 .do,what,if,see,man,old,on,street,should,we,an,we,down,fall,the4 .don't,miss,bus,you,if,up,the,you we must stop -------(cut)down the trees.cut是不是用原形