Complete the following sentence with a (compound) word derived from the one(s) given in bracket.
Children may go on the trip only with the permission of their parents or （ ）. (guard)
【正确答案】：GUARDIANS
【题目解析】：
根据前文or说明空格处应该填与parents同词性的词，填名词复数，guard的名词为guardian，复数为guardians监护人，保卫者，且符合句意。句意：孩子只有在父母或监护人的许可下才能去旅行。