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Look at the books in the library. What's the matter?
The preposition on should be changed to in. The books here are in the library. In means "in …".

Look at the books in the library.

Look at the books in the library.

In the library

English [in? laibr? Ri] beauty [? n? Me? labr? ri]

In the library;

I met her in the library.

I met her in the library.