unit 9

The water in this river is so___that we can't use it

The government should ___more national parks to protect the endangered species.

We should use environmentally friendly materials to___the environment

Ann told us that she would take a holiday___

John told me that his father___in the garden then

___contributes mainly to the greenhouse effect which can lead to a series of environment problems

The___ is the rise in temperature caused by gases in the atmosphere.

Local people had better be aware___the need for protecting the environment

What diseases can air pollution cause?

What else can cause air pollution in cities?