_______ puzzles me most is that I don’t know _______ the difference between those two lies.
_________surprises us most is that she doesn’t even know _________the difference between the two lies.
It’s beyond words. Nowhere else in the world _______ such a wonderful house!
Was it when he returned he was caught in a snowstorm?
Is this research center _________ you met some foreign guests last week?
Either you or he _________ to be invited to the party.