no. 1 middl schoolmarch 5, 1997dar ditor,our school lis at th foot of a mountain with a small rivr passing by. it usd to look lik a bautiful gardn. thr usd to b grn trs and all kinds of flowrs in our school yard all yar round.but grat changs hav takn plac sinc a chmical works was built nar our school two yars ago. it producs poisonous gass and pours a larg amount of wast watr into th rivr. th trribl pollution has don grat harm to us studnts and tachrs as wll as to th surroundings.it's tim for us to tak stps to protct our surroundings and prvnt thm from bing pollutd.yours vr,wang hong