工厂排放的有害气体会污染空气。

Harmful ___gases from factories can pollute the air.

实验室工作人员不小心被泄漏的有毒气体熏到了。

The lab workers were accidentally ___gassed by the toxic fumes leaking from the container.

她们在咖啡馆里闲聊了一下午。

They were ___chatting away at the café all afternoon.