26. hard-working = assiduous (someone who is assiduous works hard or does things very thoroughly)

　　27. difficult = arduous (if something is arduous, it is difficult and tiring, and involves a lot of efforts)

　　28. poor(soil) = barren, infertile (used to describe the soil is so poor that plants cannot be planted on it)

 　 29. fragile = brittle, vulnerable (someone who is vulnerable is easily hurt emotionally or physically)

　　30. show = demonstrate (to demonstrate a fact means to make it clear to people)

　　31. big = massive (large in size, quantity, or extent), colossal (use this word, you emphasize something’s large), tremendous (INFORMAL)

　　32. avoid = shun (if someone shuns something, she/he deliberately avoid that something or keep away from it)

　　33. fair = impartial (someone who is impartial is able to give a fair opinion or decision on something)

　　34. attack = assault (physically attack someone), assail (attack violently)

　　35. dislike = abhor (abhor means you hate something to a extreme extent for moral reasons), loathe (dislike very much)

　　36. ruin = devastate (it means damage something very badly, or utterly destroy it)

　　39. always = invariably (the same as always, but better than always)

　　40. forever = perpetual (a perpetual state never changes), immutable (something immutable will never change or be changed)

　　41. surprise = startle (it means surprise you slightly), astound (surprise you to a large degree), astonish (the same as astound)

　　42. enthusiasm = zeal (a great enthusiasm), fervency (sincere and enthusiasm)

　　43. quiet = tranquil (calm and peaceful), serene (calm and quiet)

　　44. expensive = exorbitant (it means much more expensive than it should be)

　　45. luxurious = lavish (impressive and very expensive), sumptuous (grand and very expensive)

　　46. boring = tedious (if you describe something tedious, you mean it is boring and frustrating)

　　47. respect = esteem (if you esteem someone, you respect and admire him/her. FORMAL)

　　48. worry = fret (if you fret about something, you worry about it)

　　49. cold = chilly (unpleasantly cold), icy (extremely cold)

50. hot = boiling (very hot)

（来源：网络）