I didn’t know that he was a cheat, or else I ________________ him.

You can’t imagine that a well –behaved gentleman ______ be so rude to a lady. 

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

He is an hour late by now．He         last night．

         for the free tickets, I would not have gone to the films so often.