Rewrite the following sentences into passive voice.
1. My sister painted the picture.
2. His friend laughed at him.
3. The gardener prepared the soil.
4. We must listen to his words.
5. We can store the water in the tanks.
6. Do not insult the weak.
7. Pay that bill today.
8. I am watching you very carefully.
9. John is writing letters.
10. They have built a new bridge across the river.
11. They have announced the result.
12. Why did you do it?
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