Once upon a time,a(n)________famous scientist said that life was not easy for any of us but first of all we should believe in ourselves.
—People often don't appreciate what they have, do they? —No, _________ they lose it.
— Where were you last night? We had a wonderful party. — Oh, ________ If you had called me, I wouldn’t have gone to the cinema.
The white building, ______ threats to pull it down, is now a private house in the possession of a retired professor.
Everyone doesn’t agree to the plan.Some support it while I’m one of ______ opposed to it.
The two friends ______ on line for three hours, and they will go on.