S1 문장의 [______]에 들어갈 단어는?

난이도 고난도 · 힌트를 덜 열수록 높은 점수 (현재 5점)
For most people, the word "property" just refers to "[______]": land, yes, but also the structures on that land, as well as physical possessions and even intangibles like ideas or radio frequencies.