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

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

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

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

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

Tonya had dumped a lot of rubbish on the beach. She was strongly criticized for that.

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

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

Sam had not worked hard enough in his previous job. He regretted it.

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

I have seen him before. I remember that.

Since the farmers used too much chemical fertilizer on their farm, they now have to drink polluted water.

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