Rewrite the sentences, using perfect gerunds

II. Rewrite the sentences, using perfect gerunds
. 1. David did his homework and they went to bed
→ After having
2. It is easy for anyone to learn how to cook
. → Learning
3. Tony had rescued the kids from the fire. People admired him for that. → People
4. He had dumped lots of rubbish onto the beach. He denied it. → He denied 
5. After Ha had read some documents about Green Earth, she decided to join the organization.→ Having ___________________________________________________________________________6. I have seen him before. I remember that. → I
 7. You had saved the lives of hundreds of wild animals. Thank you for that. → Thank you 
8. They had hunted and killed many wild animals. Later they regretted what they had done. → They regretted 
9. Since Mai had refused Nam's offer of a lift in his car, she had to walk home. → Having
10. 'You've lied to us, the villagers said. The politician denied it. → The politician 
11. The factory had dumped tons of toxic waste into the river. It was heavily fined for that. → The factory 
12. Thanh had forgotten to turn off the gas cooker before he left his house. He admitted that. → Thanh admitted