Abrías;durmió
“Mientras” is a present word so it’s happening now, the rest of the sentence should be present too, so abrías and durmió
First of all, you need to translate this sentence in order to find out which word to use to fill the gap.
'A comb and ___ are used to comb or brush your hair.'
So, the word we need here is a brush. In Spanish, the word brush is el cepillo.
