Complete the following sentence with a (compound) word derived from the one(s) given in bracket.
They have been through a lot together in their fifty years of （ ）. (marry)
【正确答案】：MARRIAGE
【题目解析】：
根据前文的of，说明空格处应该填名词，marry的名词形式为marriage婚姻，且符合句意。句意：他们在结婚的五十年来里一起经历了许多事。
