SIX RHYMING RIDDLES
From  What Am I? Vol.1
Zach Guido

1)
I run, but cannot walk
I make noise, but cannot talk;
If you say "Move me" -
Remember, I may be thirsty.

2)
Constantly moving,
I must work while you're awake;
But when you're sleeping,
I take a long break.

3)
You always have me with you,
You always leave me behind;
No problem - if you do as you should,
But I can betray you if you're not good.

4)
I go through the ceiling,
I go through the floor;
I don't have a handle,
But I do have a door.

5)
I'm based on seven letters,
Though my name has only five.
I have keys - but I don't have locks,
I'm concerned with time, but not with clocks.

6)
Brothers and sisters,
I have seven;
I used to have eight,
But one didn't rate.

Answers:

1. Engine
2. Eyelid
3. Fingerprints
4. Elevator
5. Piano (based on A, B, C, D, E, F, G)
6. Any planet in the solar system, other than Pluto