Answer:
How many months of the year have 28 days?
It covers you, you lose it every day and you'd die without it.
You are on an electric train. Which direction will the smoke fly in?
A person's greatest asset.
What calls for help, when written in capital letters, is the same forwards, backwards and upside down?
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?