阅读下面材料，在空白处填入适当的内容（不多于3个单词）或括号内单词的正确形式。

    Until recently daydreaming was viewed as a waste of time or it ____ (consider) an unhealthy escape from real life and its duties．But now some people are taking a fresh look at daydreaming．Some think it may be a very ____ (health) thing to do．Some researchers are finding that daydreaming may be important to mental health．Daydreaming, they tell us, ____ a good means  of relaxation．But its benefits go____ this．A number of psychologists have conducted experiments and have reached some____ (surprise) conclusion．

    Dr．Joan T．Freyberg has concluded that daydreaming contributes growth．It also improves____ (concentrate),attention span, and the ability to get along with others．Industrialist Henry J．Kaiser believed that much of his success was due____ the positive use of daydreaming．Florence Nightingale dreamed of becoming a nurse．The young Thomas Edison pictured____ as an inventor．

    For these notable achievers, it appears that their daydreams came  ____．Dr Harry Emerson Fosdick offered this advice: “Hold a picture of yourself…in your mind's eye, and you will be drawn toward it．Picture yourself ____ (vivid) as defeated and that alone will make victory impossible．

20世纪80年代初，邓小平谈到：“建国以后，人家封锁我们，在某种程度上我们也还是闭关自守，这给我们带来了一些困难……总之，三十几年的经验是，关起门来搞建设是不行的，发展不起来。”这实际上强调了（    ）

下列各句中划线的词语使用正确的一项是（  ）

在胰岛细胞中，与合成和分泌胰岛素有关的一组细^胞器是（ ）。