Previous answers appearing (or not) in queue

So… I realy appreciate when the previous answer of the parent rem appears when the child rem is being answered, because I can do something like this::

how many countries the european union have?:: 27
of these, how many are on euro zone?:: 8
name them (multi-line card)
country 1
country 2

country 8

This way I can remember all the items in a list without worrying about missing (because I know the number o items)

The problem is, sometimes the previous answers appears and sometimes not, I wish I knew how to control this