By the time you come back, your aunt ______ for Nanjing to attend a meeting.  

--Tom! Did you go to see the film Journey to the Center of the Earth?  --- Yes, but I really _______ , because I had lots of homework to do.

It is demanded that the plan _____ out as soon as possible. 

There was plenty of time. She ______ .

—I don’t suppose they could have finished their experiment,      they?—       , they are still doing it in the lab.