Good Riddles

Question: What begins and has no end, and ends all things that begin?

Question: What do you get when you cross a cheetah and a burger?

Question: It takes one word to separate them; otherwise they are inseparable.

What are they?

Question: What's wet and dry Takes you low Moves real fast And kills you slow ?

Question: I have 13 arms, 10 legs, 2 head, and smell like burnt denim.

What am I?