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-_____you sing and dance at this late hour of the night?
-Sorry, I will stop right now.

—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?

--We need a man full of wisdom to take charge of the project.
--________ the young man graduating from Harvard have a try?

When disaster strikes, you _____ find yourself without water, gas and electricity.

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

There was something wrong with the network，or the e-mail____ earlier.

--- My son is _____ to be seen. Where has he gone?
--- I think he _____ in the building.

-----You ______ it up during the meeting
------I_______ know it was so sensitive an issue. 

He ______ it on schedule, but somehow he fell behind.

They urge the local government that the problem ________ as soon as possible.