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

Quiz for Verb: 'To die'

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

'Die down' - Decrease or become quieter

'Die away' - Become quieter or inaudible (of a sound)

'Die off' - Become extinct

'Die out' - Become extinct or disappear

'Die back' - When the parts of a plant above ground die, but the roots remain alive

'Die for' - Want something a lot