Unit 112 Where did this come from?這是從哪兒來的?

Unit 112 Where did this come from?這是從哪兒來的?
    (Sword / a big knife/ white radish)
    Where did this come from?
    I have no idea.
    I have no idea.
    I haven’t the slightest idea.
    I haven’t the foggiest (idea).
    I have no idea where he lives.
    I don’t know where he lives.
    I don’t know when he is coming.
    I have no idea when he is coming.