暴徒们突然爆发了暴力行为，整个街道陷入了混乱。

The mob suddenly ___erupted into violence, throwing the whole street into chaos.

当老师讲完那个笑话，全班突然爆发出一阵大笑。

The whole class suddenly ___erupted in laughter when the teacher finished telling the joke.

他的背上突然冒出了很多红疹。

Many red rashes ___erupted on his back suddenly.