In the following passage, some words have been deleted. Read the passage carefully and select the most appropriate option to fill in each blank.

I think that perhaps the sky is a (1) ________ sea of fresh water and we, (2) ________ walking under it, walk on top of it; perhaps we see everything (3) ________ down and the earth is a (4) ________ of sky, so that when we die, we fall and (5) ________ into the sky.