In this task, you're given an article and an answer. Your task is to generate the fill-in-the-blank question for this answer based on the given article. The blanks are always at the end of the question, and can be filled with more than one word or phrase.

Article: Basic Study Manual (Hardcover): $37.50...... Here are the answers to the questions most often asked by students. Read this book and learn: *What the three barriers to study are and what to do about them * What to do if you get tired of a subject you are studying *Twenty-six simple drills to help you learn how to study easily, rapidly and with full understanding Buy and read the Basic Study Manual and use it to dramatically improve your ability to study. Study Skills for Life (Hardcover): $31.99 L. Ron Hubbard's study technology for teenagers opens the door to their future success by giving them advice on how to study and learn. Fully illustrated for easy comprehension. Learning How to Learn (Hardcover):$24.99 The basics of effective study for 8 to 12-year-olds, fully illustrated. Children who read and apply the materials in this book can regain their liking for study. Get this book for a child you want to see win at his studies! How to Use a Dictionary Picture Book for Children (Hardcover):$34.90 In spite of billions of dollars spent on "educational research", children are not taught the most basic skills of learning: how to use a dictionary. Written for children 8 to 12-year-old, this fully illustrated book will teach your children: *How to find words in a dictionary *The different ways that words are used *How to use a dictionary to correctly pronounce words At last, you'll just pay 50% for these books before May 1, 2007. (260 words) 
 Answer: children
The four books can mostly satisfy_.