https://online2.tingclass.net/lesson/shi0529/0009/9784/147.mp3
https://image.tingclass.net/statics/js/2012
Each September volunteers clean up the beach. Hundreds of volunteers clean up the beach. They carry empty trash bags. They pick up trash. They fill up the trash bags. They fill up hundreds of trash bags. They put all the trash bags into trucks. The trucks take the trash bags to a landfill. The trash goes from the beach to the landfill. Every year there is more beach trash. Every year there is more landfill trash. Jill picked up trash for three years. Finally she said, "People leave trash here every year. They know we will pick it up. We shouldn't pick it up. In a few years, trash will cover this beach. People will stop coming here. They will stop leaving trash here."