Пре­об­ра­зуй­те, если это не­об­хо­ди­мо, слово ONE так, чтобы оно грам­ма­ти­че­ски со­от­вет­ство­ва­ло со­дер­жа­нию тек­ста.

And so here Melanie was, on the way to school. And even though she felt as if her heart might explode out of chest, for the ___________ time in her life she was truly happy.