21．Waterpollutionmakesourriversandlakes．22．pollutionmakesustalklouder．23．Weneedtodoalotofthingstopollution．24．Factoricsmustcleantheirwastewaterbeforeitisaway．25．Iftherearefewerpeopleonth

Question

21．Water pollution makes our rivers and lakes___．
22．___pollution makes us talk louder．
23．We need to do a lot of things to___pollution．
24．Factorics must clean their waste water before it is___away．
25．If there are fewer people___on the roads there will be less pollution．

Answer 1

21．dirty  22．Noise  23．fight  24．thrown  25．driving