Classics, modern fiction, non-fiction and more. Written for secondary and adult students the Oxford Bookworms Library has seven reading levels from A1-C1 of the CEFR.Our world is changing fast. We can travel and speak to people around the world, and use computers to do all kinds of things. But in some places, children go to bed hungry at night, and cannot drink clean water. And many species of animals and plants are now in danger as our climate changes and pollution worsens.