The workers are talking about the doctors and the offices ____ they visited yesterday.

I made up my mind that under nocircumstances ______ agree to such a principle.

How clean and tidy your bedroom is! –Thanks. It ______ every day.

A conversation _____ a wise person is worth ten year’s study of books.

He ____ writing the paper now. He hadn’t written a single word when I left him ten minutes ago. [ ]