We found all the rivers seriously to pollute.（)

Whether ways will be found to stop pollution or not is just which worries the public.

All of the following contribute to the extinction of species EXCEPTA．hunting.B．pollution.C

We must take precautious measures to prevent the river______.A．to be pollutedB．from pollut

We have made up laws to protect the water from being polluted and the animals _____

We found that the plane_____ when we got to the a

We found it impossible __________ all the questi