下面的短文有10处空白，短文后列出12个词，其中10个取自短文，请根据短文内容将其分别放回原有的位置，以恢复文章原貌，将正确选项写到答题卡上。

Mental Activities Help Save Memory

     Doing mental activities is helpful. Reading books and writing at any age may save memory, a new       31      finds.

     The study was conducted by some American neurologists (神经病学家). It  32  294 people. They were given    33   on memory and thinking. They had the tests once a year for six years. They were also asked to talk about their mental activities during childhood, in their youth, during middle age and at their  34  age.

     Some of those people did mental activities both   35    and late in life. They had a slower   36   of decline in memory than the others. The others    37   did such activities. Their rate of decline in memory was 48%   38   .

      “Mental activities like reading and writing are great. They    39   bring benefits. We shouldn’t   40  their effects on our children, ourselves and our parents," said Robert Wilson, lead author of the study.