This is a test of commonsense. Complete the next sentence:

How to cover a book
Choose paper to cover your book with.
For books without covers or to protect your textbooks, make a paper cover for your book. You can cover your books with foreign or old newspapers, old or new maps, sheet music, old wall paper, a brown paper bag, etc.. unless you are covering a smaller book, you will need a large piece of paper to make your cover.
It will need to be at least double the length of your book and three inches taller than the height of your book. Cut the paper to size using the measurements for your book.