Final answer:
The unscrambled sentences are about planting trees, watering grass, protected areas, landfill waste, and recycling.
Step-by-step explanation:
1. Nobody in my family had planted trees before I did.
2. We hadn't watered the grass when we left.
3. This country hadn't had any protected areas before the law was accepted.
4. Landfills hadn't been incinerating waste before the oven was set.
5. In the past, Mexicans didn't know that recycling had brought the benefits to other countries.
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