Choose the correct form of adjective for the given sentence:
There were old, decrepit buildings lying __________ in the centre of the city.

In the given sentence, an adjective should be used in the blank to describe the noun 'buildings'.
- The first option 'Vacant' means "(of a place) not occupied; empty" is an adjective that is correct.
- The second option 'Vacancy' is a noun that is incorrect.
- The third option 'Vacantness' is a noun that does not have any meaning or existence.
- The fourth - option 'Vacantly' is an adverb that is incorrect.
- Hence, the option 'Vacant' is the correct answer.
Correct sentence: There were old, decrepit buildings lying vacant in the centre of the city.