contaminate|contaminated|contaminates

不良朋友圈可能会污染年轻人的价值观。

Bad company can ___contaminate young people's values.

受污染的水源很快让整个村庄的居民都生病了。

The ___contaminated water source quickly made all the villagers sick.

工厂排放的废水污染了附近的河流。

The waste water from the factory ___contaminates the nearby river.