填空题

Most people feel lonely sometimes. But it usually only lasts between a few minutes and a few hours. This kind of loneliness is not (36) . In fact, it is quite normal. For some people though, loneliness can last for years. Now (37) say there are three different types of loneliness. The first kind of loneliness is (38) . This is the most common type. It usually disappears quickly and does not require any special attention. The second kind, (39) loneliness, is a natural result of a particular situation - for example, a family problem, the death of a loved one, or moving to a new place. Although this kind of loneliness can cause (40) problems, such as headaches and sleeplessness, it usually does not last for more than a year. The third kind of loneliness is the most (41) . Unlike the second type, chronic loneliness usually lasts more than two years and has no specific cause. People who (42) habitual loneliness have problems (43) and becoming close to others. (44) to improve their conditions. (45) , e.g., friends, family members, co-workers, etc. We depend on various people for different reasons. For in- stance, our families give us emotional support, our parents and teachers give us guidance, and our friends share similar interests and activities. (46) . They question their own popularity.