填空题
As long as the American land was not completely settled and the elements of civilized order were not yet imposed on the frontier, the (36) American passion for looking to the future was (37) to prophetic brooding (沉思) on material (38) and to great efforts to make those prophecies come true. But with the closing of the frontier, interest in the future took a more human form. It became the (39) of the American men and women to provide a world in which life would be easier for the next generation. (40) , at least, the closing of the frontier meant a closing of the (41) , since it was no longer possible to (42) the problem of youth’s economic future with a (43) "Go West, young men, and grow up with the country".
As a result, providing a world in which young men and women could grow up in a fairly stable country became a constant national concern. (44) If, on the other hand, the old tradition survived that everybody, no matter how wealthy his parents, (45) When the merchant’s or the lawyer’s son made some extra money by delivering papers or cutting lawns, he was probably performing an act of discipline rather than a strictly economic function. (46) , with vigor and success, for the right to a car of his own or to a free hand with the family car.