13 Oberlin College in Ohio was a renegade institution at its 1833 founding for deciding to accept both men and women as students
b for the decision at its 1833 fouding to accept
c when it was founded in 1833 for its decision to accept
d in deciding at its founding in 1833 to accept
e by deciding at its founding in 1833 on the acceptance of
答案d
动词+不定式deciding to accept 中间能插入其他成分吗？
14 Unlike a hurricane, which can be obsered from within, a tornado is so small that such a study has not been practical.
e as to be impractical of study
答案a
e为什么不对， tornado be impractical of study可以成立呀？a里面的such用的没道理，前句并没有study出现。
记得such的用法，是同样的事物再次出现时，可用。想问一下，同样的事物是说前面一定要有一模一样的单词能，还是可以对它进行抽象的概括？
18 Even though the state has spent ten years an dseven million dollars planning a reseroir along the Ubi River, the project will have to be abandoned as a result of the river becoming so heavily polluted.
b is to be abondoned on account of the ehavy pollution which the river received
e must be abandoned because the river has become so heavily polluted
答案e
b是不是没有反映出have to的意思，所以不对？
