I don’t think we have met before，________？—Yes，once at a party，but we weren’t introduced.

n’t go to that supermarket quite often, do you—-No，I only go there ________ because it’s too far away from my house.

What do you think of Tom —He has been working very hard. ______ heis an advanced worker.

These natural parks are very important for preserving many animals, which would ______ run the risk of becoming extinct(灭绝的)

How long have you retired, Grandpa?—Well, four years, But you know, I for Courtaulds for over forty years