In which 1975 hit does John Denver explain why he's grateful for simple rural life?

Don Bateman's ground proximity warning system, which the FAA began requiring in the 1970s, was designed for use in what? In "Monty Python and the Holy Grail" (1975), which role did Graham Chapman play? Who had a 1975 No. 1 hit with "Have You Never Been Mellow"? At the end of which 1975 film does police chief Brody say "I used to hate the water... I can't imagine why"? Who had a 1975 hit with the disco song "Love to Love You Baby"? Which two college dropouts founded Microsoft in 1975? Who won the Best Actress Oscar for playing Nurse Mildred Ratched in 1975? Pete Rose was the 1975 World Series MVP for which team?