We must prevent people from _(pollute) the river.

We must prevent people from _(pollute) the river. We must prevent those children from running on the road We must stop people from ___(throw)rubbish into the river the river smells terrible,people must be stopped from throwi We must prevent them from_ _ _(制造混乱）. We must try our best to prevent the lake from pollution. People must plant trees to prevent sandstorm_____ A from hap we must prevent soil from washing away 英语改错 we must take some measures to prevent the environment being Sometimes people pollute the environment. we must stop-_____(pollute) our earth We must keep the air clean and never _________ (pollute,poll