Champagne Punch
["2 c. sugar", "2 c. water", "6 oz. can frozen grapefruit concentrate", "6 oz. can frozen grape concentrate", "6 oz. can frozen orange concentrate", "4 large bottles chilled 7-Up (32 oz.)"]
["Boil sugar and water until sugar is dissolved. Cool. Add the fruit concentrates. Stir well. Add 7-Up.", "Yield: 20 servings."]
["sugar", "water", "frozen grapefruit concentrate", "frozen grape concentrate"]