My room is a mess, but I __________clean it before I go out tonight. I can do it in the morning.
daren't
shouldn't
needn't
mustn't
—Can I really get a mountain bicycle as a reward if I win the race?—Absolutely! ________.
—Do you need the electric dryer?—________.
—Why are you moving out?—________, but I just don't like the atmosphere here.
—Believe it or not, I have met him before.—No kidding? ________ you've never mentioned it?
—What's the capital of Bhutan?—________ Let's go online and find it out.