—Who______ it be that is knocking at the door? —It ______ be Father, but I’m not sure.
--- Could you do me a favour? --- It depends on ______ it is.
Doris' success lies in the fact _________ she is co-operative and eager to learn from others.
These shoes look very good. I wonder __________.
He spoke proudly of his part in the game, without mentioning ________ his teammates had done.
One advantage of playing the guitar is _________ it can give you a great deal of pleasure.