Question

Change into other voice:
Kindly replace the books in the shelf.
The librarian has taken a lot of pains to arrange them.

Answer 1

You are requested to replace the book on the shelf.
a lot of pains has been arranged to them by the librarian.

I hope this will help you.

Answer 2

Replacing the books on the books in the shelf would be kind .

A lot of pains have been taken by the librarian to arrange them.