Answer:
1.) My sister asked which pet I would like to have.
2.) The principal wanted to know what is my student number.
3.) My sister wondered why am I so sad.
4.) I don't know where I live.
5.) Your father asks when do you want go to your granny's.
6.) My cousin inquired which sweater I should buy.
7.) My friend wondered who was that beautiful girl over there.
8.) Our teacher wanted to know what do you do in your spare time.