Answer:
If you drop me I'm sure to crack but give me a smile and I'll always smile back. What am I?
I am the kind of nut that is empty at the center and has no shell.
I help engines spin and pants stay up.
I begin with the letter āiā, if you add āaā in front of me, I become a new word with a different meaning, but still sounds exactly the same. What word am I?
I have a head tail but no arms and legs.
What never gets any wetter no matter how hard it rains?