Please choose the correct ending to complete the given sentence: Education and Communications: [header] How to hold a pencil [title] Sit with your feet flat on the floor and with good posture as your write. [step] Having good posture is important when learning to hold a pencil, as you can injure your back and create bad posture habits over time. Sit in a chair with a straight back and that is short enough for you to place both feet firmly on the floor.

Ending1: [substeps] When practicing with a pencil, look down at your paper as you write and keep your eyes up as you practice. Try not to stare at your typing surface at the front of the class. Ending2: [substeps] When teaching children to hold a pencil, focusing on the child's posture is important in forming good habits. [title] Use your thumb and index finger to pick up the pencil. Ending3: [title] Keep your hands linked with your pencil. [step] Though using your hands to write, your writing skills and posture will be affected by personal preference, which may be true for anyone who is gifted with a pencil. Ending4: Remember that you will be holding the pencil and you have to keep your back straight and your chin pointed forward as you write. [title] Do not back the pencil up, to look good you will be putting unnecessary strain on your back.

Answer format: ending1/ending2/ending3/ending4