Good Riddles

Question: The more you work, the more I'll eat.You keep me full, I'll keep you neat. What am I?

Question: A man wants to have a party in thirty-one days where he will be serving his 1000 barrels of wine. The only problem is that one of his enemies poisoned one of the barrels. The poison kills any man who drinks any of the wine in about 30 days, give or take a few hours. The man has 10 plants that are also killed by the poison in 30 days and can be used to test the wine. How can identify the single poisoned barrel of wine?

Question: I have eight to spare and am covered with hair.

What am I?

Question: Red man tickle black man butt and white man jump on top.

Question: No matter the shape I sit in, you'll find me in a row. Although my name has no letters, my initials are MNO. What am I?