49. knowledge n. – knowledgeable a. (*change v. – changeable a.)
48. jewel n. – jewelry n. – jeweler n. – jeweled a.
47. invisible a. –visible [s] inaudible, inaccurate, inefficient, inconvenient incorrect
46. interrupt v. – interruption n.
45. instruct v. – instruction n. – instructive a. – instructor n.
44. innocence n. – innocent a.
43. history n. – historic a.有历史意义的 – historical a.历史的(真实事件)
historic – city/ landmark/ spot/ document historical event
42. help v. – helpful a. (*with the help of)
41. guilt n. – guilty a. (*have a guilty conscience 感到内疚)
40. Greek n. – Greece n.
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