Start by naming any country that France borders. Then name any country that borders any of those countries. Then keep going until there are no more countries left to name.
Nice idea. I think that there are some flaws, though. For example the answer to the coin question could equally be worm, snake, fish etc. How does an echo hear? I have maps that have houses. The many teeth question could also be a cog or perhaps a bicycle. Wouldn't bannister be as good an answer to the stair question as carpet? The answer to the darkness question, it seems to me, could also be cataract, blindness, blindfold etc.