阅读下面短文，从短文后各题所给的四个选项(A，B，C，D)中，选出可以填入空白处的最佳选项。

　　We are going on a long train journey．Out of the windows, we can see cars running on nearby highways, children waving at a crossing, cattle grazing(吃草)on a distant hillside, smoke pouring from factories, village houses and city skylines．

　　But 　　1　　 in our minds is the final destination(目的地)．On a certain day at a certain hour, we will 　　2　　 into the station．Bands will be playing and flags 　　3　　．Once we get there, so many wonderful dreams will 　　4　　 and the pieces of our lives will fit together like a(n)　　5　　 jigsaw(拼图)puzzle．How restlessly we pace the aisles(过道), damning(诅咒)the minutes for waiting, waiting for the station．

　　“When we reach the 　　6　　, that will be it!” We cry “When I am 18．”“When I 　　7　　 a new 450SL Mercedes Benz!”“When I put the 　　8　　 kid through college．” “When I have 　　9　　 off the debts!”“When I get a promotion(提升)．”“When I reach the age of retirement, I shall live 　　10　　 ever after!”

　　　　11　　, we come to realize that there is no such station as we arrive at once and for all．The 　　12　　 joy of life is the trip．The station is only a dream．It 　　13　　 leaves us behind．

　　“Cherish(珍视)the moment” is a good 　　14　　．It is the burdens(负担)of today that drive us to keep on 　　15　　．And it is the regrets over yesterday that motivate(激发)us to overcome the 　　16　　 and look forward to the future．

　　So 　　17　　 pacing the aisles and counting the miles．　　18　　, climb more mountains, eat more ice cream, go barefoot(赤脚)more 　　19　　, swim more rivers, watch more sunsets, laugh more and cry less．Life must be lived 　　20　　 we go along．The station will come soon enough．