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

Quiz for Verb: 'To Buy '

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

'Buy off' - Pay someone to stop them causing trouble

'Buy up' - Buy all of something

'Buy in' - Force a CD or record into the charts by buying lots of copies

'Buy into' - Accept an idea

'Buy out' - Buy somebody's share in a company