Good Riddles

Question: What goes up and down but never moves?

Question: I am important at the most dangerous times. I can not be seen, heard, or smelled. If you use me too much you would fatally die. What am I?

Question: Look at my face, I am somebody. look at my back, i am nobody. What am I?

Question: What type of cheese is made backwards?

Question: Crawls over pages and fells wild beasts.
Helps guide you along in your home and on streets.

What is it?