Which word completes the title of Milan Kundera's novel, filmed in 1988, "The ___ Lightness of Being"?

In the 1988 film "Gorillas in the Mist," Sigourney Weaver played which zoologist? In which 1988 holiday film does Jim Varney's character help Santa Claus find a successor? In 1988, who defeated Lowell Weicker to become a U.S. senator from Connecticut? Who was the Texas state treasurer in 1988 and was elected governor of Texas in 1990? In which 1988 film does Meryl Streep's character cry, "The dingo's got my baby"? In 1988 the Fatih Sultan Mehmet Bridge was completed in which city, becoming its second bridge between Europe and Asia? In which 1988 film does a baseball fan boast, "There's never been a ballplayer slept with me who didn't have the best y… Which former Los Angeles Lakers cheerleader had a No. 1 hit with "Straight Up" from her 1988 debut album?