英语改错I took part in a geography research study group in last

英语改错
I took part in a geography research study group in last term.Our topic was environmental pollution.We took a variety of our city.To our surprised,there are still a lot of people doing still things to our surrounds.Some people throw the rubbish anywhere they like,some cars give off garmful gases,and waste water is pouerd in rivers by some factories.Worse still,people sometimes gad to make their ways through dusty winds as a result of pllution.Through our research,we come to know what everybody must pay attention to our environment and some measure should be taken to protect.