We must get up at 7:00 tomorrow morning, ________ we’ll be late for the train.
and
or
but
—Look at that girl! Is it Susan? —No, it _______ be her. She has gone back to her hometown.
—Would you mind my using your dictionary? —________.
—Where are you going for your holiday? —Well, we _______ yet.
He _____ has time for concerts, does he?
—________? —She is of medium height.