There are many theories about the beginning of drama in ancient Greece. One theory【C1】_____the theater’s origin from the human interest in storytelling. According to this view, tales (about the hunt, war, or other feats) are gradually【C2】__, at first through the use of impersonation, action, and dialogue by a【C3】__and then through the【C4】_____of each of the roles by a different person.

However, the one most widely accepted today is based on the assumption that drama【C5】_____from ritual. The argument for this view goes【C6】__. In the beginning, human beings viewed the natural forces of the world as【C7】__, and they sought through various means to control these unknown and feared powers. Those【C8】__which appeared to bring the desired results were then【C9】__and repeated until they hardened into【C10】__rituals. Eventually stories arose which explained or【C11】__the mysteries of the rites. As time passed some rituals were abandoned, but the stories, later called myths, persisted and provided【C12】_____for art and drama.

Those who believe that drama evolved out of ritual also argue that those rites【C13】_____the seed of theater because music, dance, masks, and costumes were almost always used.【C14】__, a suitable site had to be provided for performances and when the entire【C15】__did not participate, a clear【C16】__was usually made between the “acting area” and the “auditorium”. In addition, there were performers, and, since【C17】__importance was attached to avoiding mistakes in the enactment of rites,【C18】__leaders usually assumed that task. Wearing masks and costumes, they often【C19】__other people, animals, or supernatural beings, and mimed the desired effect as an actor might. Eventually such dramatic representations were【C20】_____ from religious activities.

Humans are “creatures of habit”. Habits and other【C1】_____behaviors are so named【C2】__they require little planning or willpower. You just do them. But unfortunately, it【C3】_____with a group of critical brain operations known as the executive functions.

The executive functions are a set of attention【C4】_____skills that allow us to attend selectively to something, and to shift flexibly from one way of looking at it to another. They rely on working memory, willpower, and concentration. And there’s evidence that the less you【C5】__them, the weaker they become. If somebody creates routines in their life where they’re not being【C6】__and solving new problems, the brain networks supporting the executive functions would【C7】_____in the same way that unused muscles do.

Researchers have examined the【C8】_____between strong executive functioning and problems related to mood and behavior. They have found that poor executive functioning is linked to depression, drug abuse and antisocial behavior. If you don’t have a(n)【C9】__that allows you to【C10】__new challenges and to solve problems, then you will not be【C11】__the particular brain networks that are【C12】_____flexible, goal-directed problem solving.

【C13】_____much of this work, research has found that curiosity and a【C14】_____ for exploration—characteristics that lead people away from the routine and toward【C15】_____experiences—are tightly linked with improved mood and a reduced risk for depression.【C16】__our brains may be programmed to conserve resources and【C17】__familiar situations and behaviors, too much predictability seems to【C18】_____our minds in ways that raise our risks for mental and cognitive dysfunction.

Good habits are a(n)【C19】_____of a healthy, happy, and productive life. But shaking things up with travel, with challenging tasks, and with other new experiences may prevent your habits from【C20】_____ you down.

Several years into a campaign to get kids to eat better and exercise more, child obesity rates have appeared to stabilize, and might be poised for a reversal.

But a study published Monday in the journal PNAS suggests that among adolescents, the【C1】_____signs are limited to those from better-educated, more【C2】__families. Among teens from poorer, less well-educated families, obesity has【C3】_____to rise.

That class-gap was not【C4】_____in younger children. But as children neared【C5】_____, the class differences became increasingly obvious.

【C6】_____between rich and poor in obesity rates are not new, and they are only one of many health gaps that make poor patients sicker and more likely to die【C7】__than richer ones. But if the public health message on obesity “has not diffused【C8】__across the population,” this gap could【C9】__efforts to stem a tidal wave of【C10】_____obesity-related diseases in the years ahead.

Researchers from Harvard University’s Kennedy School of Government found that【C11】_____activity may account largely for the【C12】_____trend in obesity between rich and poor.

If public health experts are to prevent childhood obesity and【C13】_____drive down future obesity among adults, they’ll have to figure out【C14】__less advantaged kids don’t get as much exercise, the authors of the latest study say. Yes, lack of【C15】__centers, playgrounds, and streets and sidewalks that【C16】_____walking, biking and playing are important, they wrote.

But, they added, “this is not the whole story.” Among children with parents who【C17】_____high on the socioeconomic scale, participation in high school sports and clubs has increased. But among their【C18】__from families of lower educational【C19】__and income, such participation has【C20】_____ .