In 1975 which group took power in Cambodia, beginning a murderous four-year rule?

Who had a No. 1 hit with "Jive Talkin'" in 1975? Which star had a No. 1 hit in 1975 with a cover of the Beatles' "Lucy in the Sky with Diamonds"? Complete the title of the 1975 sci-fi film starring Don Johnson: "___ and His Dog". Complete the title of the 1975 adventure film starring Sean Connery: "The ___ and the Lion". 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"?