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

---I saw Mr. Smith at Xianyang Airport this morning.  
---You ____. He’s still on holiday in Hawaii.

You can't imagine that a well－behaved gentleman ________ be so rude to a lady.

—Is John coming by train.
—He should，but he ________ not.He likes driving his car.

There ________ be any difficulty about passing the road test since you have practised a lot in the driving school.

—It's the office！So you ________ know eating is not allowed here.
—Oh，sorry.

Keep up good state of mind even if you ________ fail plenty of times.

A left－luggage office is a place where bags ________ be left for a short time，especially at a railway station.

My sister met him at the Grand Theatre yesterday afternoon，so he ________ your lecture.

Mr.Bush is on time for everything.How ________ it be that he was late for the opening ceremony.