Statistics for What's missing?

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Hint	Answer	% Correct
John, Paul, George &?	Ringo	88%
Hearts, Spades, Diamonds &?	Clubs	85%
Norway, Sweden, Finland &?	Denmark	81%
Mercury, Venus, Earth &?	Mars	81%
England, Scotland, Wales &?	Northern Ireland	70%
Triangle, Square, Pentagon &?	Hexagon	61%
Mickey, Minnie, Goofy, Donald &?	Pluto	60%
House of Lords & House of?	Commons	55%
Gold, Frankincense &?	Myrrh	50%
Dasher, Dancer, Comet, Cupid, Prancer, Rudolph, Donner, Blitzen &?	Vixen	48%
Albatross, Eagle, Birdie &?	Par	45%
Legislative Branch, Executive Branch & ....Branch?	Judicial	44%
Charles, Anne, Andrew &?	Edward	36%
Brian May, John Deacon, Roger Taylor &?	Freddie Mercury	35%
Cavaliers &?	Roundheads	18%