In 'Grease', who plays Sandy?

In 'The Sound of Music', what is the family's surname? In 'The Sound of Music', which actor plays Captain von Trapp? In 'My Fair Lady' (1964), who plays Eliza Doolittle? In 'Singin' in the Rain', who performs the title song dance in the rain? In 'Grease', what is the name of Danny's gang? In 'West Side Story', what are the two rival gangs? In 'The Outsiders' (1983), what are the two rival groups? Which 1986 film is about a teenager who skips school with friends Cameron and Sloane?