Answer:
What goes through towns and over hills but never moves?
Doing this with your job can be risky but doing it with smoking is always a good idea
Nothing specific, but more than a few. This many clustered, together will do.
What is not a ball but yet a sphere, and holds all lands and people year after year?
These are needed to finish a test
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?