Riddles

Why does a bald-headed man have no use for keys? Because he has lost his locks.

When is a department store like a boat? When it has sales (sails).

Is there a word in the English language that contains all the vowels? Unquestionably.

What is always filled when in use and empty when at rest? A shoe.

What is it that can be broken without being hit or dropped? A promise.