The correct answer is exhibit, exhibition. This is because the word "exposition" refers to a public display or exhibition of art, goods, or information. The words "exhibit" and "exhibition" are synonyms for "exposition" and accurately describe the act of showcasing something publicly. The other options, such as "a position," "an exception," and "an excuse," do not relate to the concept of a public display or exhibition. Therefore, the correct answer is exhibit, exhibition.