Correct the mistakes:
1. pollution is one of the most serious problems since last century.
2. in the past nobody was paying attention to this problem.
3. many european countries try still to solve this problem today.
4. before everyone realized the danger, pollution became a threat to the environment.
5. every day some companies have been polluting the environment.
6. i hope the world is going to do its best to stop pollution.
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7. last week while i was watching the news i have heard that the eu leaders agree to take necessary measures.
8. by the next century people will do away with pollution.

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