The answer would be flexible in the missing blank.
Answer: The Psalms represent one of the books of the Bible (Old Testament).
Explanation:
These are songs of praise, containing prayers and expressing gratitude to God for help. The Psalms contain instructions for believers and Jews.
Psalms are songs written in verses (mostly five verses each). Many Psalms have titles and often include the names of the authors themselves.
There are 7 main characteristics of a civilization, and one of these is cities. The others include: social classes, specialized jobs and centralized governments and laws.