1.absence n.缺席→absent a.缺席的2.accept v.接受→acceptance n.接受3.access n.入口，通道→accessible adj.可进入的，可接近的4.accident n.事故→accidental(ly) adj.偶然的/地5.accuracy n.精确→accurate a.精确的6.admire v.羡慕→admirable a.令人羡慕的→admiration n.钦佩7.admit v.承认，准许（入场，入学，乞讨的英文是什么，入会）→admission n. 承认，准入8.advise v.建议→advice n.建议（不可数）9.age n.年龄→aged a.年迈的10.agency n.代理机构→agent n.代理人11.ambition n.雄心→ambitious a.有雄心的12.anger n.愤怒→angry a.愤怒的13.anxiety n.焦虑→anxious a.焦虑的14.appear v.出现，看上去→appearance n.外貌15.apply v.申请→applicant n.申请人→application n.申请 16.argue v.争论→argument n. 争论17.arrive v. 到达→arrival n. 到达18.assist v.援助→assistance n.援助→assistant n. 助手19.attract v.吸引→attraction n. 吸引→attractive a. 有吸引力的20.bake v. 烘烤（面包）→bakery n.面包店 21.balance n.平衡→balanced adj.平衡的22.beg v. 乞求，乞讨→beggar n. 乞丐23.behave v. 表现→behaviour n. 行为24.believe v.相信→belief n. 信条，信念 25.benefit n. 利益→beneficial a. 有益的26.bleed v. 出血，流血→blood n. 血液27.brave a. 勇敢的→bravery n. 勇气28.breath n. 呼吸→breathe v. 呼吸→breathless adj. 上气不接下气的29.careless adj.→carelessness n. 粗心30.casual adj.→casually adv. 随意地31.caution n.→cautious adj. 谨慎的32.center n.中心→central a. 中心的 33.certain a. 确定的→uncertain a.不确定的34.cheer n.& v.欢呼→cheerful a. 高兴的35.choice n.选择→choose v. 选择→chose过去式→chosen 过去分词36.clear adj.清楚的，清澈的→clarify v.澄清37.combine v.使联合→ombination n.联合38.companion n.伙伴（可数）→company n.陪伴（不可数）39.compete v.竞争→ompetition n.竞争→competitor n.竞争者→competitive a.有竞争力的40.complain v.抱怨→complaint n.怨言，投诉41.conclude v.总结→conclusion n.总结42. confident a.有信心的→confidence n.信心43.confuse v.使困惑→confusion n. 混乱→confused adj.感到迷惑的→confusing adj.令人迷惑的44. consider v.考虑→considerate a.体贴的→consideration n.考虑45.convenient a.方便的→convenience n.便利 46.cook v.烹调→cook n.炊事员，厨师47.courage n.勇气→encourage v.鼓励→courageous a.勇敢的48.create v.创造→creative a.有创造力的→creator n.创造者→creation n.创造→creativity n.创造力49.crowd n.人群→crowded adj.拥挤的50.cruel a.残酷的→cruelty n.残酷
