警方对超速行驶展开了严厉打击。

The police have launched a ___crackdown on speeding.

政府宣布严厉打击逃税行为。

The government announced a ___crackdown on tax evasion.

学校当局正在对欺凌行为实施严格的打击。

School authorities are implementing a strict ___crackdown on bullying.