I was not in Beijing last June, otherwise I         my son’s graduation ceremony．

The boss took no notice of the suggestion given by the clerk that the new technology _____ the problems on conveying the products.

—My goodness! The accident might not have happened if we had done it more carefully.
—But we      .

—“What courses are you going to take next semester if you want to receive enough credits to get your degree?”
—“I don’t know. But it’s about time      on something.”

It ___ be the postman at the door. It’s only six o’clock.

—Is Pro. Smith giving the speech today?
—It __________ be him. He is abroad right now.

We _____ estimate the spirit of the Shanghai Expo too much, which is sure to play an important role in our daily life.

Without Sir Tim, the father of www, keeping up with the latest ______ so convenient.

“Attention, please. Whoever can answer one of my questions _____ receive a prize,” the teacher said in class.

----- You shouldn’t have talked back to our teacher like that. It was awfully impolite.
----- You are right. I _________ crazy at that moment.