Answer:
look for the definition in a dictionary, or think of the context it is used in.
The answer to the question is called "homophones". These words have same pronunciation, but different spellings.
As soon as you're in the sky, that's outer space.
However, the atmosphere is only 40 or so miles thick.
Answer:
5. Cool - A. Warm
4. Unconscious - B. Awake
3. Raw - D. Cooked
2. Beneficial - E. Bad
1. Minor - C. Big