—Are you satisfied with what he did? —No, it couldn’t have been ______.
These shoes look very good. I wonder __________.
—What did your parents think about your decision?—They always let me do __________ I think I should.
—It’s thirty years since we last met.—But I still remember the story, believe it or not, __________ we got lost on a rainy night.
— Could you do me a favour?— It depends on __________ it is.
We haven’t settled the question of __________ it is necessary for him to study abroad.