Mary _______ her mother with the housework, but she didn’t.  

________ you interrupt now? Can’t you see I’m on the phone?_ Sorry, Sir, but it’s urgent.

Johnny, you      play with the knife; you     hurt yourself.

 My sister met him at the street yesterday afternoon, so he __________ your lecture.

My sister met him at the street yesterday afternoon, so he __________ your lecture.

The weather turned out to be fine yesterday．I        the trouble to carry my umbrella with me．

Michael       be a policeman, for he is much too short．

Being examined twice a year, whether it is a car or a bus or a truck, it is the rule that every driver____ obey in this city.

—Where did you get this book?—I picked it up from a second-hand bookshop if you ______ know.

That man in the corner of the restaurant ______ be Mr. Lee, for he went to Australia yesterday.

Without gravity, we _____ walk on the ground as freely as we do now. 

—Guess what; Yang Yang failed in the maths test .—How         it be？She is second to none in maths.

---Have you got the final result?---Yes, very disappointing. We________ have won the game.

— My sons are not a little restless．— Oh? Boys _______ be boys．

According to his will, his money ____be used to build a school instead of a market.

---______ he have been chosen as captain of our school football team? ---Yes, he______. Can’t you see he’s wearing an armband?

Nowadays, a graduate with a master’s degree_____ fail to find a high--paid job , which discourages a lot of college students.

----I passed the college entrance examination.----Congratulations! You________.

-----Someone is knocking at the door.It ____ be Tom .-----No, it ______ be him ;he has gone to Sydney.

----Shall I go and buy more food and drinks for the party ?----- No, we have prepared a fridge of those.That ____ be quite enough.