根据下面资料，回答题
Almost everyone suffers from a headache 21 (occasional). But some people suffer from repeated, frequent headaches.
What is headache What causes it What can you do about a headache What research is being done on headaches The dictionary defines headache simply 22 "a pain in the head". 23 most people mean by headache 24 (be) a pain that lasts several minutes or hours. It covers the whole head, or one side of it, or perhaps the front or the back of the head. To add to the confusion about a definition, some people call tight feeling in the head a headache.
A headache is important because 25 can be the first warning of a serious condition which probably could be controlled 26 discovered early. If a person 27 (remove) the warning, day after day, with a pain-killer, he may pass the point of easy control.
A headache is important also because it disturbs people, 28 (prevent) them from living a happy life. The 29 (employ) with a headache does less work. In a flash of temper he may upset his fellow 30 (guy) or customers, causing a direct or indirect loss to his organization. The mother with a headache suffers and disturbs the family. She upsets her husband and children.
occasionally。解析：考查副词。此处修饰动词suffers，应用副词形式occasionally。
“有为才有位，有位更有为”，这一看法给我们的启示是（ ）
对立统一规律揭示了事物发展的( )。
历史唯物主义认为人的价值在于（ ）
在认识过程中具有更为重要意义的飞跃是指（）
矛盾的普遍性与特殊性的关系是（ ）
毛泽东第一次提出“马克思列宁主义理论和中国革命的实践相结合”这个根本思想原则的著作是（ ）
真理的具体性体现在( )。
“没有抽象的真理，真理总是具体的。”这一思想可以理解为( )。
毛泽东在( )这篇文章中提出了“没有调查，就没有发言权”的著名论断。
“三个代表”重要思想是马克思主义中国化的最新理论成果。它与马克思列宁主义、毛泽东思想、邓小平理论是一脉相承的统一的科学理论。这种一脉相承具体表现在（ ）
