impel"推动，驱使，激励”。impel sb．t0 do sth．激励某人做某事；
compel"强迫，胁迫，迫使”。compel sb．to oneg will强迫人服从自己。
19．complement和compliment
complement"补足(物)，补全”，“补足语”。
compliment"恭维话，赞辞，敬意”；Your presence is a great compliment．承蒙光临，不胜荣幸。
20．continual和continuous
continual"连续，继续”；“频繁的”；continual bouts 0f toothache一阵接一阵的牙痛。(这中间可能有停顿或间断。)
continuous"连续”(指从不间断的)；weve had three weeks 0f continuous rain．我们这里连续三周下雨不停。
21．might和could
might表明“possibility’。
could应该用来表明"permission"．Mum said we could(might)g0 t0 the football match．
22．council和counsel
council"议事机构”，委员会a cabinet council内阁会议。
counsel"商议，劝告”；follow sb．s counsel close牢记某人忠告。
23．economical和economic
economic"经济学的，经济上的”an economic survey of Scotland苏格兰经济调查；an economic block．ade经济封锁；economical"节俭的，经济的”；Hes had t0 learn to be more economical now that his only in．come is a small pension．
24．historical和historic
historical"有关历史的"，“历史的”，the historical period历史阶段；historical personage历史人物。‘historic“历史上有名的，有历史意义的”，historic town历史名城。
25．infer和imply