Good Riddles

Question: I am very strong and tough but can be broken in some ways. What am I?

Question: A man named Edward was born on December 21st, yet his birthday is during the summer this year.

How could this be?

Question: I am a nice word composed of five letters, but the Romans would call me a numbers.

What am I?

Question: If you're looking for something sweet I know what to do.
But if you don't like heat I'm not for you.

What am I?

Question: What has classes but moves?