It's the fact _____ he doesn't know his own birthday surprises us all.
—No, I’m afraid he isn’t in. This is his secretary speaking. Can I help you? —____
. —Let’s go and have a good drink tonight.—___ Have you got the first prize in the competition?
___ other good students, in my opinion, Tom is _____ student.
Professor Black has written some short stories, but he is ____ known for his plays.
_____ for the free tickets, I would not have gone to the theatre.