Misc: what's the most common fowl on earth?

Questions

Wizard Of Oz: "Exactly So!", says the wizard, "I am a ______"?

Beer: Most experts say you don`t have a pilsner if you don't use this kind of hops.?

Beer: Cheaper non-barley grains such as rice and corn are referred to by this term.?

Quotations: It's the economy, stupid.?

Quotations: He's dead, Jim.?