—Do you regret not having accepted their invitation?—Why should I? I        as much, but I’m glad to devote myself to what interests me most.

The number of the people who own cars ______since 1990.

--May I remind you that Mr. White is waiting outside, Mrs. Green? ---Oh, I _________ all about it. 

John _______ for London this afternoon and his flight _______ off at 18:20.

—Has Sam finished his homework today?—I have no idea. He ________ it this morning.