I forgot to add these very last sentences. Thank you very much for all!
1) I last felt sorry when my best friend lost his father in a car accident.
2) I last felt sorry for a friend of mine, whose father was run over by a lorry while crossing the road.
2) That happened two years ago.
3) Are you ever ashamed of yourself? On what occasion? Yes, I'm sometimes ashamed of myself when can't answer my teachers' questions.
4) Would you mind if I stopped working ten minutes earlier? No, not at all.
I think you should organise a surprise birthday party for your boyfriend and invite all his friends.
5) Perhaps you should talk through your problems with your parents.
6) I once blamed my friend for not lending me her car.I was furious with really furious with her.