—Jack, _____ you behave yourself? You're no longer a kid．
—Sorry, Daddy．It won't happen again．

I _____thank you too much for all your help to my son while we were away from home.

I have promised that my daughter _______ get a new electronic dictionary on her next birthday.

The boss ______ the worker how to do it, or the accident couldn’t have happened.

It    be difficult to get a train ticket during traditional Chinese Spring Festival this year because there are many ticket windows.

--Life ____   be very hard for people living in the north of Canada as it is very 
cold there in winter.
—Yes, the weather there _____   be as low as 60℃ below zero.

Sir, a Mr. Wang is waiting for you at the gate. ________ he come in or stay there?

I didn’t know Headmaster Weng was away for Beijing. I       to his office yesterday.

You _________to the meeting yesterday. What was the reason for your absence?            

Tom hasn’t come to work since last Friday.       he have had an accident?