What Am I Riddles

Question: I can run but never walk. Wherever I go, thought are close behind me.

What am I?

Question: Given to all man then taken away, you can beg for more time but I never stay What am I?

Question: My food and drink were left behind
by ancients from another time.
I grind my feet upon the earth
with strength come from a metal hearth.
My mind is trapped when I run free
when still, it wanders far from me.

What am I?

Question: You went into the forest and got me,
you sat down to find me,
you went home with me because you couldn't find me.

What am I?

Question: I am a big threat to humanity,
but you wouldn't get rid of me even if you could.

What am I?