Read the passage and choose the correct answer.
In the past, people lived in tribes, which were small groups that (16)____________ each other's basic needs like food, shelter, and fire. Over time, with agricultural and industrial changes, people moved to cities. This shift has made (17)____________ from our environment. Today, we often live in small family units in separate apartments, where each unit is mostly independent. (18)____________, we still need social connections, like the ones we had in tribes, to share experiences and enjoy each other's company.
Our modern “tribe” includes family, friends, colleagues, and neighbors. While we have close emotional bonds with family and friends, neighbors are valuable because (19)____________ are physically close to us. They are nearby all the time, and we share spaces like staircases, elevators, and buildings with them. How our relationships with neighbors turn out can (20)____________ when we move into a new apartment. However, by helping each other, communicating respectfully, and (21)____________, we can create a friendly community right next door.