des livres légèrement usés or des livres usagés
You can say "Merci pour les livres" in French to thank someone for the books.
'his science books in french' I mean come on it's not that hard, you seem to be able to type it.
trois livres
J'aime les livres.
"troisième partie" - used mainly in books or episodes of TV series
Dictionnaries are real great books, you know!
Nous aimons les livres.
une couverture (for covering beds or to protect books)
moitié prix des livres
tous mes cahiers d'exercice
Je suis fatigué de livres.
In French, "ciao" can be used as a casual way to say goodbye, similar to how it is used in Italian. It is not a formal way to say goodbye in French.