—I can't repair these until tomorrow，I'm afraid.—That's OK. There's ________.

—I’ll take at least 2 hours to do this!—Oh, _____!I could do it in 30 minutes. 

— David has been in high spirits these days?— ______ He should win the first prize in the composition test.

 —May I ask a question after class，Sir?—       , but not during my lunch break.

—Look! What’s on that door? —It’s a card saying “____”.