7. Having replaced all the lights bulbs in her house with LED lights, she saved a lot of money on her electricity bills
8. Sam regreted having not worked hard enough in his previous job
9. The police supected Mike of having cut down the oldest tree in the park
10. Having used too much chemicall fertiliser on their farm, the farmers now have to drink polluted water.
11. Denis was rewarded for having taken an active part in the Green Summer activities
12. Having learnt about the benefits of recycling and reusing, the students started collecting waste paper, bottles, and cans to recycle and reuse
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