A 6,000-pound segment of which structure was put on display at the Reagan Library?

A 5,500-mile section of which structure runs from Mount Hu near Dandong to a spot in Gansu province? A six-day fast by which leader in 1932 changed the way India's "untouchables" were treated? Which six-time Best Actress nominee, for films such as "The King and I", received an honorary Oscar in 1994? Which word completes the name of the Emmy-winning reality show "The ___ Race"? Which 1960s civil rights leader is known for the phrase "by any means necessary"? A 7 & 7 cocktail combines Seagram's 7 Crown whiskey with which soft drink? What word means an improvised military camp with little or no shelter? A 7-year-old chess prodigy is at the center of which 1993 film that names an American chess champion in its title?