16.long after 在…很久之后 shortly after 在…不久之后 17.through 穿過(guò) 18.think of 想到,想起;考慮(+ing) think about (it) 考慮think (it)over 仔細(xì)考慮 19.worth 值得(+n./ing) 20. be worth of doing 21.burst into +n./ing. 22.for the sake of 為…起見(jiàn) 23.in the front of (內(nèi)部的前方) 24.drop sb. a line 給某人留下聯(lián)系方式 =keep in touch with