What Am I Riddles

Question: What has 6 wheels and flies?

Question: I have Eighty-eight keys but cannot open a single door?

What am I?

Question: I have two arms, but fingers I have none. I've got two feet, but I cannot run. I carry well, but I carry best with my feet off the ground. What am I?

Question: I have lakes with no fish.
I have roads with no cars.

What am I?

Question: My first two are male, and my first three female.
My first four save them both, and my whole is a female of the same sort.

What am I?