Complete the sentences with the words in the box. leak, government, waves, organisation, smog, chemicals, cause, experiment 1. Were 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.

1-experiment;2-smog;(smoke);3-chemicals;4-leak;5-waves;6-government;7-cause;8-organisation