Complete the sentences with the words in the box.leak, government, waves,

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.