这片土地被塑料垃圾严重污染。

This land is severely ___polluted by plastic waste.

城市的空气因为工厂排放而变得污染严重。

The city's air became heavily ___polluted due to factory emissions.

社交媒体上的仇恨言论污染了年轻人的思想。

Hate speech on social media has ___polluted the minds of young people.