Answer:
Upon your lonely journey I accompany you, whether you travel through endless mountains or seas of blue. Wherever you go, I keep your place. Lost you're not, when I'm embraced. What am I?
Light hides me and darkness kills me. What am I?
Open me, and you can't see me without a mirror. Close me and you can't see me at all. What am I?
What do you get when you cross a pig with a karate expert?
I go around in circles, but always straight ahead, never complain, no matter where I am led.
I flow from the Homerβs mouth when he sees doughnuts.