Complete the sentences with the words in the box.
leak, government, waves, organisation, smog, chemicals, cause, experiment
1. We're going to do a(n) ____________ in my science class this afternoon.
2. I believe that all this _____________ is caused by car fumes.
3. ____________ from factory waste have polluted the river.
4. The factory was closed and the workers were sent home because there was a gas ___________.
5. The sea was quite rough and the _____________ were dangerous.
6. It is essential that the _______________ takes measures to stop the pollution of our rivers.
7. The main ________ of the problem is the tons of toxic waste polluting the lake.
8. My father works for a(n) _________ that protects marine life.