2. PASSIVE SENTENCES IN THE PAST



1.-Pollution affected this area two years ago.
2.-Scientists studied global warming in the last year conference.
3.-Leonardo DiCaprio listed several environmental issues in his speech.
4.-Some farmers overused chemicals in Extremadura in the XX century.
5.-Europe consumed too much oil in the last decade.
6.-Climate changes caused the rise of temperature.
7.-Most countries ratified the Kyoto Protocol in 2001.
8.-Deforestation destroyed some forest ecosystems in South America.
9.-Chemicals contaminated drinking water.
10.-Environmentalists saved some endangered species after the oil spill. 

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