Complete the following sentence with a (compound) word derived from the one(s) given in bracket.
More often than not, （ ）attendance at school may lead to failure in the exam. (regular)
【正确答案】：IRREGULAR
【题目解析】：
本题考查常见形容词的反义词。
由名词attendance可知，空缺处应填形容词，分析语境，导致考试失败具有负面性，regular的反义词是irregular意为“不规律的”，more often than not意为“通常”。
句意：通常来讲，不按时上课可能导致考试失败。