Rewrite the sentences using perfect gerunds or perfect participles?

Rewrite the sentences using perfect gerunds or perfect participles1. Someone had started a fire in the forest. Tom admitted that he had done it. 2. In the Tree Planting Competition, the students in Group 11G planted the most trees in the schoolyard. They were praised for that.3. After we made all necessary preparations, we put our plan into action.4. After I watched the documentary about wildlife, I made a donation to an environment society.5. After I ate my evening meal, I decided to go for a walk.6. Someone had cut down the oldest tree in the park. The police suspected Mike of doing it.7. He had dumped lots of rubbish onto the beach. He denied it.8. You had save the lives of hundreds of wild animals. Thank you for that.9. Because I had spent the whole day cleaning up my room, I need to take a shower and have a rest.10. Since the authorities had managed water resources irresponsibly, they had to deal with water shortage.11. After we had read the stories about people who reduced their carbon footprint, we started to change our daily consumption habits.12. They had hunted and killed many wild animals. Later they regretted what they had done.13. The factory had dumped tons of toxic waste into the river. It was heavily fined for that.14. Denis had taken an active part in the Green Summer activities. He was rewarded for that.15. Because the farmers had been told about the dangers of chemical fertilizers, they turned to bio-fertilizers.16. After I finished all my homework, I watched my favourite film on TV.