What Am I Riddles

Question: Black were are and much admired, Men seek for us if they are tired We tire the horse but comfort man, Tell me this riddle if you can.

Question: I am a thing, when I look at him , he looks at us!! who am I???

Question: What is often picked but seldom chosen, never walks but can run when frozen?

Question: I'm small but big, i hide behind you but come out when you fall... What am I?

Question: I'm measured in temperature and time, but have neither.

What am I?