Is 'To Crack' Separable or Inseparable? - Phrasal Verb Quiz

Quiz for Verb: 'To Crack '

Is the phrasal verb 'To Crack ' separable or inseparable in the following examples?

'Crack down on' - Use more authority than usual

'Crack up' - Burst out laughing

'Crack up' - Damage a car badly

'Crack up' - Have bad reception on a mobile phone

'Crack on' - Continue doing something with energy

'Crack up' - Have a nervous breakdown