Answer:
What word is a plural, but when you add an "S" to the end, it becomes singular?
A red drum which sounds without being touched, and grows silent, when it is touched.
Thousands lay up gold within this house, But no man made it. Spears past counting guard this house, But no man wards it.
A hill full, a hole full; yet you cannot catch a bowl full. What is it?
What is long and slim, works in light. Has but one eye, and an awful bite?
If it’s information you seek, come and see me. If it’s pairs of letters you need, I have consecutively three. What am I?