---I think Miss Lin must be in the library. She said she would go there.---No, she __________be there. I have just been there.

–Mr. Wang, can I finish my homework tomorrow?   --Sorry, you ________. 

—The research on the new flu virus vaccine is challenging and demanding. Who do you think can do the job?     —_______ my students have a try?

As a well-known Chinese saying goes, “If you want to be rich, you______ first build roads.”

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