This Set Includes: Delicious Dairy (21) Level 3 , Fantastic Fruits (21) Level 3 , Great Grains (21) Level 3 , , Sensible Salts, Sugars, and Fats (21) Level 3 , Vibrant Vegetables (21) Level 3 . The 21st Century Basic Skills readers support the development of reading skills as they introduce students to vocabulary and content they will use for a lifetime. Let your young readers discover the joy of reading for information as they build reading fluency.