He talks in terms about the promise of American life.

Slowly ,however , many of the people who were living ___41__ in the towns began to grow tired of ___42___. They began to feel interested in looking for things that could not be explained , for sights and sounds which produce a feeling of fear and excitement .___43___in the __44___century, people began to turn away from the man-made __45___ to the untouched country, and particulary ___46___a place where it was dangerous and wild. High mountains began to be __47__ for a holiday.

Then , mountain-climbing began to grow popular as a sport. To some people ,there is something greatly __48__about getting to the _49___ of a hight mountain . Struggling against nature is finer than a battle __50____ other human beings. And then, when you are at the mountain top after a long and difficult__51__, what a _52____ reward it is to be able to look _53___on everything within__54___! At such time, you feel happier and prouder than you can ever feel down__55____.