答案:bemadenottoallowsmoking.表示做决定做某事用makeadecisiontodosth.否定就是做决定不做某事makeadecisionnottodosth主语是adecision,是make的承受者,构成被动语态,加上前面的情态动词should,这里用情态动词的被动语态---情态动词+be+过去分词,make的过去分词made,故bemadenotto,允许做某事allowdoingsth,吸烟smoke,去e加ing,故答案是bemadenottoallowsmoking.