Misc: What is the element symbol for Sodium?

Questions

Say Cheese: Italian origin; mellow; appetizer, dessert.?

Say Cheese: This Mother Goose character was eating what we'd call cottage cheese.?

Advertising: "Progress is our most important product."?

Advertising: He hit the big time after commercials for McDonalds and State Farm?

Advertising: They advertised their cola as "Taste that beats the others cold"?