These are designed to help【C1】______their skills, abilities and appreciation of life; to give them a chance to practice leadership and【C2】______responsibilities;【C3】______school courses; and to provide additional outlets and stimuli. There is often a【C4】______of activities from which to choose, such as nature clubs, musical organizations, science clubs, art and drama groups, or language clubs. A【C5】______selection of sport activities is always available.【C6】______every school has a student-run newspaper; often a photographic darkroom is also【C7】______. Some of these activities take place during the school day, but【C8】______are held after classes are over.【C9】______they are optional they【C10】______a part of the American educational experience. Parents encourage their children to participate in those programs that【C11】______suit their own special talents and interests. Much is learned during these off-duty hours, especially in【C12】______of human "give-and-take". Americans believe this【C13】______human relationships, social skills, and a well-trained body,【C14】______intellectual development. Both【C15】______and college admissions officers in the United States carefully consider the extracurricular activities【C16】______students have participated, both during their free time after school and also during the long holidays. These indicate to them【C17】______of a young person's leadership potential, enthusiasm, creativity,【C18】______of interest, vitality and personality. They weigh these qualities, together with the academic record, in order to【C19】______a student's intelligence, perseverance, and ability to use what he knows,【C20】______merely repeating it by rote on examination papers.
【C1】

A. broaden
B. extend
C. stretch
D. concentrate