21. cook, cooker

　　cook廚師，cooker廚具 He is a good cook.

　　22. damage, damages

　　damage不可數(shù)名詞, 損害，損失; damages復數(shù)形式, 賠償金 $900 damages

　　23. police, policeman

　　police警察的總稱，后接復數(shù)謂語動詞，policeman 指某個具體的警察 The police are questioningeveryone in the house.

　　24. problem, question

　　problem常和困難連系，前面的動詞常為think about, solve, raise，question常和疑問連系，多和ask,answer連用

　　25. man, a man

　　man人類，a man一個男人 Man will conquer nature.

　　26. chick, chicken

　　二者均可指小雞，chicken還可以當雞肉 The chicken is delicious.

　　27. telegram, telegraph

　　當電報解時，telegram指具體的，telegraph指抽象的 a telegram, by telegraph

　　28. trip, journey, travel, voyage

　　travel是最常用的，trip指短期的旅途，journey指稍長的旅途，voyage指海上航行 a three-day trip

　　29. sport, game

　　sport多指戶外的游戲或娛樂活動，如打球，游泳，打獵，賽馬等;game指決定勝負的游戲，通常有一套規(guī)則His favorite sport is swimming.

　　30. price, prize

　　price價格，prize獎，獎品，獎金 win the first prize The price is high/low.