1 Such inns as there were were generally dirty and flea-ridden;

这里的AS THERE WERE是不是“可以这么说”的意思，或者印刷有错误。

2 Stone does not decay, and so the tools of lLONG AGO have remained when even the bones of the men who made them have disappeared without trace.

难道LONG AGO 可以作名词，或者OF后面有省略？

3 not all sounds made by animals serve as language, and we have only to turn to that extraordinary discovery of echo-location IN bats to see a case in which the voice plays a strictly utilitarian role.

再问一下这里的IN如何解释

欢迎大家指点，讨论，谢谢，感谢大家以往的帮助！

1.
这里的AS THERE WERE是“作为当时有的”的意思，是让步状语省略从句。

2.LONG AGO 不可以作名词，或者OF后面有省略，是的。省略的是"which are" 。

3.这里的IN可解释为“在什么中间”，地点状语。