Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to be productive while entertaining yourself [title] Decorate your books. [step] Doodle on everything and let your imagination run wild; just be sure that these are your own books and not books that you have borrowed or have just found. [substeps] Try using pictures to help you memorise things.

Ending1: If you have something you need to remember for school or work, create a picture-system so that whenever you need to remember, you will think of that picture! Experiment with different styles of art. Try drawing something you wouldn't usually think of. Ending2: Draw a picture directly on the front cover of each book. Let the characters who have been in your book make their way back into your mind's eye (because it works that way), leaving them as think pieces at the bottom of the page. Ending3: Who knows? You may be surprised at how amazed people with respect to personal history can be when they first see what a famous author has drawn! [title] Use your few-cut coral pencils. [step] Use unique colors to give the look. Ending4: You can select the boxes of your favorite books or fill up several empty ones with pictures. Remember, drawing on markers is not enough.

Answer format: ending1/ending2/ending3/ending4