Write out from the text in exercise 7. a sentence in the present perfect continuous tense; two sentences in the past indefinite passive; one sentence in the past indefinite tence; three sentences in the present indefinite tense; text 7. for more than a century britain has been developing policies to conserve the natural and built heritage and protect the environment against pollution from industry and other sources. britian helps international organizations on environmental protection. the government controls over waste, air pollution, litter, noise and water pollution. the national rivers authority is responsible for the control of water pollution in england and wales. the south-west coast of wales was seriously affected by one of britian's largest oil pollution incidents in 1996: oil leaked into the sea. however, a major clean-up operation was done.

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