Clean riddles with simple answers

What always sleeps with his shoes on?

The day before two days after the day before tomorrow is Saturday. What day is it today?

What is something you will never see again?

What can you swallow than can also swallow you?

What can you hold in your left hand, but not in your right hand?

What kind of room has no doors or windows?

What bird can lift the most?

Which city is three fifth chick two third cat and 50% goat?

What has to be broken before you can use it?

A container without hinges, lock or a key, yet a golden treasure lies inside me. What am I?