Mischievous Dennis Mitchell is better known as Dennis the what?

Complete Gertrude Stein's famous line: "A ___ is a ___ is a ___ is a ___". Something entirely different is said to be "a ___ of a different color". Which animal fills the blank? Saad Eddin Ibrahim, a critic of President Hosni Mubarak, was cleared on retrial in 2003 of defaming which country? Which silent film star was known as "The Man of a Thousand Faces"? Which word for a group is often used in the phrase "a ___ of beauties"? Which word names both a Tibetan ox and to chatter endlessly? Which Israeli prime minister was assassinated in November 1995? Which term for a time when late payments aren't penalized could also describe Monaco from 1956 to 1982?