What Am I Riddles

Question: I plow and plow, but never sow.

What am I?

Question: A man travels by wagon,
brings joy each evening,
but depression by the morning.

Who is he?

Question: I give advice to others,
yet I know nothing myself.
I am a hitchhiker destined to stay still.

Question: I have no wings but I fly,
I have no teeth but I bite.

What am I?

Question: Shake me and I'll do what you want,
but first you have to pull me from the ground.
I'm on the tip of your tongue and over your shoulder.

What am I?