pourriez vous me faire 3 phrases simple en anglais en utilisant WHICH

1) My phone which we used to do selfies yesterday is broken.
2) Which book did you buy ?
3) Which candidate are you voting for ?

Voilà ! :) Ta prof va être épatée ! :)

wich bag is yours? the blue one or the red one?
Wich one or these pictures do you prefer?