[中文]
21. 玻璃是易碎的。
22. 黃金是昂貴的。
23. 雪是白的。
24. 牛奶是營養的。
25. 氧氣是重要的。
26. 糖不是鹹的,而鹽不是甜的。
27. 愛是盲目的。
28. 時間是寶貴的。
29. 健康是無價的。
30. 數學是困難的。
31. 感冒是會傳染的。
32. 抽煙不是有益健康的。
33. 歷史和語文不是科學的。
[英文] 21. Glass is brittle. (= Glass's brittle.) 22. Gold is expensive. (= Gold's expensive.) 23. Snow is white. (= Snow's white.) 24. Milk is nutritious. (= Milk's nutritious.) 25. Oxygen is important. (= Oxygen's important.) 26. Sugar is not salty and salt is not sweet. (= Sugar's not salty and salt's not sweet. = Sugar isn't salty and salt isn't sweet.) 27. Love is blind. (= Love's blind.) 28. Time is precious. (= Time's precious.) 29. Health is priceless. (= Health's priceless.) 30. Mathematics is hard. (= Mathematics's hard.) 31. Influenza is infectious. (= Influenza's infectious.) 32. Smoking is not healthful. (= Smoking's not healthful. = Smoking isn't healthful.) 33. History and language are not scientific. (= History and language're not scientific. = History and language aren't scientific.)