Fill in the gaps with right words based on the passage's information.

Loneliness is a feeling of sadness or isolation that (a) ____ when a person (b) _____ meaningful social connections or companionship. The main causes of loneliness include social isolation, (c) _____ of loved ones, lack of communication, moving to a new place, or feeling (d) _____ by others. To prevent loneliness, we should badly (e) ______  regular contact with family and friends and join social activities.