Expressing Apologies 道歉

字號(hào):

I am sorry. Please excuse me for coming late.
    It doesn't matter.
    I am sorry, but I can't find the book you lent me.
    That's all right.
    I must apologize I failed to complete the work on time.
    Don't worry about that.
    I'm awfully sorry. I forgot to post that letter for you.
    Oh, never mind.