Answer:
What has keys but no locks, Space but no room, You can enter but you can’t exit.
Small, containing light, You'll need it in the dark, It will provide that spark, and shine into the night. Will light up any pyre, 'Cause it can help make a fire.
What kind of nail can be grown?
What goes through towns and over hills but never moves?
Possibly the word most commonly said before taking a sip
What has wheels and flies but is not an aircraft?