Good Riddles

Question: We have what we did not find; what we did find we left behind.

[What do we have?]

Question: Occurring once in a hundred years and once in thousands. But never in a day or a year or a century.

Question: What is 5,000 years old and still turning?

Question: One night a man and woman got on th boat. The man and woman got off. Who were left.

Question: Name two different words using following words only... 1. Without me 60% living beinga cant survive.. 2. Without me none ( living+non-living cant survive... 3. Both have five letters each but both r anagrams of each other..