Entering the room,I found Mary____ at the desk and____ a letter.
—What do you think we can do for our aged parents?—You do anything except that you visit them as often as possible. don’t have to B. oughtn’t to C. mustn’t D. shouldn’t
---May I remind you that Mr. White is waiting outside, Mrs. Green? ---Oh, I _________ all about it.
Sixty miles ________ in a single night, so they were exhausted.
--- Had we been more careful, the accident might not have happened. --- But we _____ at that time.
He will stop showing off,if no notice of him.