Answer:
Three little letters, a paradox to some. The worse that it is, the better it becomes.
I know a word of letters three. Add two, and fewer there will be!
Lovely and round, I shine with pale light, grown in the darkness, a lady's delight.
People are hired to get rid of me. I'm often hiding under your bed. In time I'll always return you see. Bite me and you're surely dead.
Pregnant every time you see her, yet she never will give birth.
If lightning strikes an orchestra who is the one most likely to get hit?