The scientist does not study nature ________ it is useful to do so. He studies it because he takes pleasure in it.
—You seem to show interest in cooking. —What? _________, I'm getting tired of it.
—I believe we've met somewhere before. —No, _________.
If by any chance someone comes to see me, ask them to have a __________.
They were surprised that a child should work out the problem ________ they themselves couldn't.
Mary has _______ a difficult question to me.