53. we agree to accept _d_ they thought was the best tourist guide.
a whatever b whomever c whichever d whoever
they thought是插入语，可以不看; tourist guide 导游。
56. although many people view conflict as bad， conflict is sometimes useful _c_ it forces people to test relative merits of their attitudes and behaviors.
a by which b to which c in that d so that
句子的意思是：如果冲突以后能回家反省一下自己是好事情。
in that 因为; conflict n. 冲突; relative merits 相比较而言的优点; so that 以至于。
57. he is _a_ about his chances of winning a gold medal in the olympics next year.
a optimistic b optional c outstanding d obvious
optimistic adj. 乐观的; pessimistic adj. 悲观的; be optimistic about 对…持乐观态度。
optional adj. 随意的，任选的，非强制性的; optional courses 选修课;
outstanding adj. 卓越的，杰出的; obvious adj. 明显的。
58. sometimes i wish i _b_ in a different time and a different place.
a be living b were living c would live d would have lived
wish后加的句子一定要用虚拟语气。
与现在事实相反，wish后的句子经常用一般过去时来体现虚拟语气。
59. the director was critical _c_ the way we were doing the work.
a at b in c of d with
be critical of 对…….爱挑剔的，批评。
60. in a sudden _b_ of anger， the man tore up everything within reach.
a attack b burst c split d blast
within reach 够得着; out of reach 够不着; burst 爆发，迸发;
burst可以与很多词语搭配表示突然发作：
1 能与人的情绪（喜、怒、哀、乐）搭配; 2 能与掌声、笑声搭配。