Answer:
What has a mouth but can't chew?
What an fill a room but takes up no space?
Which word contains 26 letters but only three syllables?
In marble halls as white as milk, lined with a skin as soft as silk. Within a fountain crystal-clear. A golden apple doth appear. No doors there are to this stronghold, yet thieves break in and steal the gold.
Often held but never touched. Always wet but never rusts. Often bits but seldom bit. To use it well you must have wit.
I have two eyes in the front and a lot of eyes on my tail