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

Quiz for Verb: 'To Plough '

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

'Plough back' - Re-invest money you have made into a business

'Plough through' - Eat a big meal

'Plough into' - Collide into at speed

'Plough up' - Break the surface of soil

'Plough through' - Read something that is difficult or takes a lot of time

'Plough through' - Move through somewhere where there is little space or there are obstacles

'Plough on' - Continue doing something you don't want to