音乐会结束后，地上散落着垃圾。

After the concert, the ground was strewn with ___litter.

在公共区域经常能看到垃圾。

You often see ___litter in public areas.

志愿者们聚集起来清理海滩上的垃圾。

Volunteers gathered to clean up the ___litter from the beach.