人物传记类文章的阅读策略 — 英语词汇题

根据句意和首字母提示补全单词（本单元核心词汇）。1. The old craftsman spent his whole life p___ his skill, refusing to give up even in hard times. 2. His d___ to his work impressed everyone who read his biography. 3. After years of p___, he finally became a master of his trade.