Elige las palabras correctasa?

Elige las palabras correctas a. - Susana was talking on the phone while / when I went to bed. B. - Julio was playing soccer while / when he hurt his leg. C. - I was riding my bike While / when I fell off. D. - We saw my cousin while / when they were doing the shopping. E. - My father arrived while / when they were finishing the game - f. - My brothers fell asleep when / while they were watching TV. Ayúdenme Por Favor!