Please choose the correct ending to complete the given sentence: Health: [header] How to improve your health during spring semester [title] Wash your hands between classes. [step] When you go around school and college buildings, which are frequented by students, faculty, and staff, you come into contact with all of their germs. To prevent yourself from becoming sick from these germs, wash your hands whenever you touch desk, doorknobs, and other commonly used communal objects or spaces.

Ending1: Bacteria and bacteria can be extremely contagious, so it's best to keep a close eye on people who may be infected. [substeps] Don't touch other people to avoid spreading these germs. Ending2: To wash your hands properly : [substeps] Wet your hands with water. Apply soap, scrubbing the backs of your hands, in between your fingers, and under your nails. Ending3: [substeps] Try to wash your hands throughout the day for no more than 30 seconds at a time. This will prevent your germs from spreading to other surfaces. Ending4: [substeps] Make a habit of touching any other communal objects or equipment. Students will be more sensitive to germs if they're reminded about your presence.

Answer format: ending1/ending2/ending3/ending4