Answer:
I am the only thing that place today before yesterday. (one word)
You use me between your head and your toes the more I work the thinner I grow.
I am always hungry, I must always be fed. The finger I lick will soon turn red. What am I?
If you drop me, I'm sure to crack. Give me a smile and I'll always smile back. What am I?
Weight in my belly, trees on my back, nails in my ribs, feet I do lack. What am I?
When someone uses this acronym, you know you've got to pick up the pace