3.find words that best complete the sentences. each line corresponds to one letter. some letters have already been given. 1. car _ x _ _ _ _ _ emissions are a major source of lead pollution in the atmosphere. 2. the company is very environmentally friendly: all the products come in _ _ _ d _ _ _ _ d _ _ _ _ packaging. 3. using energy efficiently reduces the emission of _ _ _ _ _ h _ _ s _ gases. 4. oxygen in the atmosphere forms a screen – the ozone layer – which filters the _ _ _ _ a _ _ _ l _ _ rays of the sun. 5. the chernobyl nuclear power plant accident released huge amounts of r _ d _ _ _ _ _ n into the environment. 6. the dinosaurs _ _ _ d out 65 million years ago. 7. _ m _ _ _ is the major cause of air pollution in big cities.

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