A serious study of physics is impossible________some knowledge of mathematics.
The man didn’t choose _________ of the hats and went away without looking at a third one.
It was ______ who did it, but it was _______ that we are talking about.
I’m looking for a flat. I’d like _______ with a garden.
He is not _______ as a leader but he has gained _______ in teaching.
He was ______ medical student before he turned _______ engineer.