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Here are the corrected sentences: 1. Not provided 2. A volcano erupted violently in the South Pacific last week. 3. Students should learn some practical ways to help protect the environment. 4. My brother is working as a volunteer for an animal protection organization. 5. We cleaned up everything at the campsite before we left. 6. We were playing football at 5 o'clock yesterday afternoon. 7. Protecting the environment must be the job of everyone in the community. 8. Natural disasters can cause serious damage to human life. Here are the corrected sentences and the location of the mistakes: 1. I often go to the local market to buy home-grown vegetables. Mistake: C (Incorrect word order) 2. Cutting down a lot of trees is very harmful to the environment. Mistake: A (Incorrect adjective form) 3. While I was listening to the radio, I didn't hear the fire alarm. Mistake: B (Incorrect verb tense) 4. We cannot prevent natural disasters, but we can predict some of them. Mistake: A and D (Incorrect word choice and incorrect pronoun) 5. While people were talking to each other, he was reading his magazine. Mistake: A, B, and D (Incorrect verb tense, incorrect verb choice, and incorrect pronoun) 6. They lost all of their property due to the volcanic eruption. Mistake: A, B, C, and D (Incorrect word choice, incorrect preposition, and minor adjustments to sentence structure) Here are the combined sentences: 1. We were planting trees while our friends were collecting rubbish. 2. Don't go away yet until you finish cleaning up the place first. 3. When the bell rang, everyone rushed out of the classroom. 4. As soon as I arrive there, I will phone you. 5. Before you go to the party, don't forget to lock the door. 6. I didn't learn much about wildlife until I visited Cuc Phuong National Park last week.