Change the sentences according to directions :

We should read books so that we can gain knowledge.

We are introduced to the realm of knowledge by books.

Don't the books of great writers contain noble thoughts and great ideas?

By reading books, we can enrich our minds.

Books are not the worst enemies./No other friend is as great as books.

They give us not only knowledge but also pleasure.

They are our real friends and so they remain with us in time of danger.

How interesting some books are!

We can build up a developed society if we read books.

Only books can remove the darkness of ignorance.