—I regret _____ you that Mary was badly injured in the accident. —I can hardly believe my eyes. She is always so careful.

So far nobody has claimed the money       in the library.

They prefer to spend time _____ rather than _____ in the street.

 With a lot of difficult problems ____, the manager felt like a cat on hot bricks.

The policeman looked around and caught a man      his hand into the pocket of a passenger.