EngagementsDeVries - KostosA May wedding is being planned by Mary DeVries of Brookfield, 111., and Jeff Kostos of Palos Hills.DeVries, the daughter of Heather and Lorenz DeVries of Park Forest, is a 1983 graduate of Rich South high school and a 1987 graduate of Bradley university. She is employed as a registered nurse at Loyola university medical center.Kostos, the son of Rosemary and George Kostos of Racine, Wis., is a 1982 graduate of Rich South high school and a 1986 graduate of Bradley university. He is studying for a master of business administration degree at Loyola university. He is employed as a mechanical engineer by Ardco company.Mary DeVries and Jeff KostosSuber - CohnThe engagement of Sonya Suber of DeFuniak Springs, Fla., and Charles Cohn of Hurlburt Field in Florida was announced recently.Suber, the daughter of Juanita and A. P. Suber of DeFuniak Springs, is a 1984 graduate of Walton senior high school. She is employed at the Elgin Air Force Base Exchange.Cohn, the son of June Cohn of Glenwood, is a 1981 graduate of Bloom high school. He is a member of the U.S. Air Force stationed at Hurlburt field.No wedding date was announced.Charles Cohn and Sonya Suber