9.luckily adv.幸运地;幸亏→lucky adj.幸运的→luck n.运气 10.thankfully adv.感激地;满怀感谢地→thankful adj.感激的 11.warning n.警告→warn v.警告 12.erupt vt.(火山的)爆发;喷发→eruption n.(火山的)喷发 13.hopefully adv.满怀希望地;有希望地→hopeful adj.满怀希望的;有希望的→hope vt.& n.希望 14.sadly adv.伤心地;不幸地→sad adj.悲伤的→sadness n.悲伤 15.active adj.积极的;活跃的→act v.行动;举止→action n.行为→activity n.活动→actor n.男演员→actress n.女演员