46. certain adj. 肯定的,确认的I’m ~that/It is ~that

positive adj. 确定的,确信的,肯定的(←negative)sure adj. 一定的,有把握I’m ~ (不能说: It is ~)that

47. certainly adv. 当然,无疑

surely adv. (我敢)肯定,定然会

48. chance n. (幸运或偶然),机会by~ 偶然/意外地

occasion n. 时机,(某个时刻提供的)机会by~of 由于

opportunity n. (适合某人做某事的)良机,机遇

49. character n. (人、物由charasteristic组成的)总特征

feature n. (部分细节之形状、重要性)特征,脸面特征,五官

characteristic n. (突出而稳定,区别于他人的本质)特征,特点

property n. (物理)属性

50. cheat v. (为私利、不诚实)而欺骗,骗取;作弊

deceive v. (歪曲真相的)欺骗,诱骗

fool v. 愚弄,哄骗