Complete the following sentence with a (compound) word derived from the one(s) given in bracket.
We believe that the key to an organization’s （ ） is the development of great leaders and great employees. (effective)
【正确答案】：EFFECTIVENESS
【题目解析】：
根据前文organization’s可知，空格处应该填名词，effective的名词形式为effectiveness有效性。句意：我们认为一个组织的有效性的关键是培养伟大的领导者和优秀的员工。