21. cook, cooker
cook廚師;
cooker廚具 eg:He is a good cook.
22. damage, damages
damage不可數名詞, 損害，損失;
damages複數形式, 賠償金 eg:$900 damages
23. police, policeman
police警察的總稱，後接複數謂語動詞;
policeman 指某個具體的警察 eg:The police are questioning everyone in the house.
24. problem, question
problem常和困難連繫，前面的動詞常爲think about, solve, raise;
question常和疑問連繫，多和ask, answer連用
25. man, a man
man人類;
a man一個男人 eg:Man will conquer nature.
26. chick, chicken
二者均可指小雞;
chicken還可以當雞肉 eg:The chicken is delicious.
27. telegram, telegraph
當電報解時，telegram指具體的.;
telegraph指抽象的 eg: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 eg:a three-day trip
