Which word for a wreath of flowers is also the surname of singer Judy?

Which South American capital sits on the Río de la Plata, across the river from Buenos Aires? A world's fair opened in May 1986 in which British Columbia city, where Princess Diana fainted? Complete the phrase for a worthy, honest person: "the ___ of the earth". Sara Jane Moore and Lynette "Squeaky" Fromme both tried to assassinate which president in 1975? Which wrinkle-faced breed of dog comes from China? What is a writer of 14-line poems called? A writer said he'd eat his T-shirt if Andre Agassi won which British event in 1992? A WWII Marine, which director earned the nickname "Bloody Sam" with films like 1969's "The Wild Bunch"?