To my great disappointment, my best friend left the city I could have a word with her.
—I'm so sorry about last night—it was all my fault. —________.
—Shall I help you with the math problem? —________.
—Why don't we just leave it until tomorrow? —________ I'm dead tired today.
—I forgot my mother's birthday! —________ Better keep it in mind next year.
—Would you mind giving me a lift? —________. I am happy to.