1) I think that books have souls and should be preserved because sometimes they are can be our friends, life guides. Also, they contain our whole history, which should not be forgotten and preserved.

2)I don't think so, because you can make a bookshelf for your future children and so on. But, if don't want to keep them you can also sell books. 

3)It is a good idea to download books from the internet because they are cheaper than a paper variant. But I think internet books don't have romantics of readings where you highlight some phrases,  quotes.

4) I don't agree with this opinion because usually, books help us to calm down a little from the hustle and bustle, forget about routine life, about the internet, about whole problems.

And also we can educate from books on the internet.