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13.in deciding at its founding in 1833 to accept
可以。at its founding in 1833 提前是为了强调。

14.so as to 的使用没有问题，但to be impractical of study的表达不符合规范，应用impractical for。such a study指代obsere the tornado from within，相当于such a study that a tornado can be obseved from within.

18.b is to be abondoned on account of the heavy pollution which the river received不对是因为
(1)which 引导的从句时态不对。应用has received.
(2)on account of 使用不对。主语是the project,而不是the state,不能用on account of.

in spite of 和despite作介词时用法无区别。