Good Riddles

Question: I'll amuse you for an entire evening, But you won't remember me. What am I?

Question: How do you fix a broken tomato?

Question: Why do cows wear bells?

Question: Something all men have,
but all men deny.
Man created it,
but no man can hold it.

What is it?

Question: Surrounded by life , yet life is its biggest enemy. But without life there is no need for it to exist. What is it?