Effective reading requires not only "reading between the lines," but also "writing between the lines. " There are two ways in which one can own a book. The first is to (21) for it. But the act of purchase is only the (22) to possession. Full (23) won’t come unless you have absorbed the ideas to do you any good. There are kinds of book owners. The first has all the (24) sets and best-sellers—unread and (25) . The second has a great many books, all of which as clean and shiny as the day they were bought. The third, however, has a collection of books that are all dog-eared and dilapidated. Marking up a book is (26) to reading. First, it keeps you awake. Second, active reading is (27) , which expresses itself in words. Finally, writing helps you remember the thoughts you had or the thoughts the author expressed. Light fictions like Gone with the Wind do not require active reading. They can be read in a state of (28) . But great books cannot be read while you’re asleep. There are a number of devices for marking a book intelligently and (29) For example, (30) , vertical lines at the margin, stars or asterisks at the margin, numbers in the margin, numbers of other pages in the margin and circling of key words or phrases.