当演员表演得很糟糕时，观众开始发出嘘声。

The crowd started to ___hiss when the actor performed poorly.

他愤怒地低声威胁道：‘别多管闲事！’

He ___hissed angrily, 'Mind your own business!'

猫靠近时，那条蛇发出嘶嘶的警告声。

The snake made a warning ___hiss when the cat got too close.