John has put forward _______ most challenging question for us to answer.-Yes, it really is. I have never heard _______ harder one.

My dad is quite busy these days. He has been working for two days without ______.

You aren’ t a student , are you — _____ , don’ t you remember _____ me in the classroom ten minutes ago .

He then proceeded to smile brightly, ______and thanked the newsstand owner for the newsstand’s being open on such a morning.

I supported him in time , otherwise he_______off the bike .