Final Answer:
Justin's family grew tired of living in the crowded, busy city, so they moved to a calmer area. The word that best completes the sentence is "suburb."
Step-by-step explanation:
The sentence suggests a desire for a change in living environment from a crowded, busy city to a more serene and peaceful place. The word "suburb" fits well in this context, as it typically refers to a residential area on the outskirts of a city, characterized by a quieter and more relaxed atmosphere. The choice of "suburb" conveys the idea of moving to a location that offers a break from the hustle and bustle of the city, aligning with the family's preference for a calmer living space.
The word "suburb" is apt because it not only signifies a quieter environment but also implies a certain proximity to the city, allowing for a balance between accessibility to urban amenities and the tranquility of a residential area.
This choice encapsulates the notion of seeking a more peaceful living experience while still maintaining a connection to urban conveniences. Overall, "suburb" enhances the clarity and specificity of the sentence, providing a concise and fitting description of the family's desired change in surroundings.