He had dumped lots of rubbish onto the beach. He denied it.

The factory had dumped tons of toxic waste into the river. It was heavily fined for that.

Thanh had forgotten to turn off the gas cooker before he left his house. He admitted that.

Denis had taken an active part in the Green Summer activities. He was rewarded for that.

You had saved the lives of hundreds of wild animals. Thank you for that.

After she replaced all the light bulbs in her house with LED lights, she saved a lot of money on her electricity bills.

Since we have become too dependent on the use of electricity, we have to find alternative sources of energy before fossil fuels run out.

 After Ha had read some documents about Green Earth, she decided to join the organisation.

'You've lied to us,' the villagers said. The politician denied it.

Someone had cut down the oldest tree in the park. The police suspected Mike of doing it.

They had hunted and killed many wild animals. Later they regretted what they had done.

After the students had learnt about the benefits of recycling and reusing, they started collecting waste paper, bottles, and cans to recycle and reuse.