Which 1999 horror film was presented as found footage of three student filmmakers?

Which 1973 horror film is about the demonic possession of a girl named Regan? Which horror film features a cursed videotape that kills viewers in seven days? In which horror film do characters communicate using sign language to avoid sound-hunting creatures? In which horror film are characters forbidden to look at creatures, so they wear blindfolds? Which 1968 George A. Romero film launched the modern zombie genre? Which 1933 film features a giant ape climbing the Empire State Building? What is the name of the giant Japanese monster first seen in a 1954 film? In 'The Wizard of Oz', what color are Dorothy's slippers in the film?