Please choose the correct ending to complete the given sentence: Youth: [header] How to survive an epidemic in your school [title] Identify the cause of the virus. [step] Did everyone who got sick eat the cafeteria food? Bring a bag lunch. Your school might post a notice on its website, or send an e-mail to your parents.

Ending1: If the source of your flu virus needs to be clearly identified, ask them to help you find some solution. [substeps] There's no single cure for some viruses. Ending2: Look for signs of the outbreak or have a talk about it with your classmates. [substeps] You might even need to bring some antiseptic products. Ending3: Regardless of the culprit, come up with a plan to stop it. [substeps] The most important thing you can do is stay safe and put yourself and your loved ones at risk. Ending4: You may want to keep your cell phone with you at all times. [title] Call your parents if the sickness is very bad.

Answer format: ending1/ending2/ending3/ending4