What Am I Riddles

Question: I'm just a lot of nothing but I'm every were... what am I?

Question: I run out of battery but never need to be changed what am I?

Question: I was always in the beginning of time but faded as time passed by. When people use me in a sentence they never forget to use good grammar. When people play dice with me they never win against me but I hate gambling. When people find me they always get a heart of a lion. Who am I?

Question: A cat,mouse,and dog all had an instrument,the dog had a flute,the cat had a trombone and the mouse's instrument bugs the dog.What was the mouse's instrument?

Question: Without me you're blind but once you touched in the right place you can turn me on. What am I?