Write three questions. You want to know: a) where your friend lived when he wqs little b) what he (she) is interested in now c) where he (she) is going for his (her) winter holidays

a). Where did you live when you were little?

Past Simple. Question about the fact that refers to the past.

b). What are you interested in now?

Present Tense of the construction "to be interested in".

c). Where are you going for your winter holidays?

Present Continuous to ask about the plans for the future.