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1. Did you forget to turn off the TV this morning?
2. The hot weather makes me so depressed.
3. Did a group of foreigners visit the slums last week?
4. Although that woman is very rich, she is so modest.
5. Pollution is the most serious problem, isn't it?
6. Renewable energy will be used in the future.
7. Overpopulation causes a lot of social problems in this area, doesn't it?
8. My uncle used to live in the country when he was child.