Which South American capital sits on the Río de la Plata, across the river from Buenos Aires?

Complete the proverb: "A word to the wise is..." what? Complete the title of Jim Carroll's memoir: "The ___ Diaries". Complete the title of George Gershwin's 1924 work: "___ in Blue". A work week of how many days was not generally accepted until the 1930s? 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 word for a wreath of flowers is also the surname of singer Judy?