工厂向空气中排放了有毒烟雾。

The factory released ___toxic fumes into the air.

最糟糕的是汽车排放有毒气体，破坏臭氧层。

The worst thing is that cars give off ___toxic gases which destroy the ozone layer.

一些植物如果被摄入是有毒的。

Some plants are ___toxic if ingested.