—May I do the rest of the work tomorrow?—Yes, of course. You        finish it today.

—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?

A hard-working man        become a great scientist, but a great scientist        be a hard-working man.

If you _____ smoke, please go outside because this is a non-smoking office.

—Could I invite my friends to my birthday party?—Sorry, you ______.