Answer:
What goes up the hill and down the hill, And spite of all, yet stand still?
The yellow house has yellow window, the red house has red windows, what colour windows does the green house have?
A man was sitting on his couch and searching for the English Channel. How did he find it?
What moves and touches water but doesn't get wet?
What is the difference between yesterday and tomorrow?
I stand in one place yet fill the whole room. I can be filled with molten rock and come in every hue. What am I?