As many people hit middle age, they often start to notice that their memory and mental clarity are not what they used to be. We suddenly can’t remember_____（1）we put the keys just a moment ago, or an old acquaintance’s name, or the name of an old band we used to love. As the brain_____（2） , we refer to these occurrences as “senior moments.”_____（3）seemingly innocent, this loss of mental focus can potentially have a(n)_____（4）impaction our professional, social, and personal_____（5）.

Neuroscientists, experts who study the nervous system, are increasingly showing that there’s actually a lot that can be done. It_____（6）out that the brain needs exercise in much the same way our muscles do, and the right mental_____（7）can significantly improve our basic cognitive_____（8）. Thinking is essentially a _____（9）of making connections in the brain. To a certain extent, our ability to_____（10）in making the connections that drive intelligence is inherited._____（11）, because these connections are made through effort and practice, scientists believe that intelligence can expand and fluctuate_____（12）mental effort.

Now, a new Web-based company has taken it a step_____（13）and developed the first “brain training program” designed to actually help people improve and regain their mental_____（14）.

The Web-based program_____（15）you to systematically improve your memory and attention skills. The program keeps _____（16）of your progress and provides detailed feedback _____（17）your performance and improvement. Most importantly, it_____（18）modifies and enhances the games you play to_____（19）on the strengths you are developing much like a(n）_____（20）exercise routine requires you to increase resistance and vary your muscle use.