Correct the mistakes:
1. Pollution has been one of the most serious problems since last century.
2. In the past nobody paid attention to this problem.
3. Many European countries are still trying to solve this problem today.
4. Before everyone realized the danger, pollution had become a threat to the environment.
5. Every day some companies are polluting the environment.
6. I hope the world will do its best to stop pollution.
7. Last week while I was watching the news I heard that the EU leaders agree to take necessary measures.
8. By the next century people will have done away with pollution.
He wasn't wearing a jaket
2). He was smoking a pipe
He wasn't smoking a pipe
3). He was cerrying a bag
He wasn't cerrying a bag
4). He was cerrying an umbrella
He wasn't cerrying an umbreller
5). He was going to a dentist
He wasn't giong to a dentist
6). He was wearing a hat
He wasn't wearing a hat