Please choose the correct ending to complete the given sentence: Youth: [header] How to make friends in school when you are extremely shy [title] Smile at others. [step] Smiling is the most important thing you can do to look friendly and approachable. When you catch someone's eye or someone talks to you, smile-it lets the person know that you're glad to interact, even if you don't know what to say.

Ending1: [substeps] You don't have to walk around wearing a grin all the time because that would be unnatural. Just practice keeping an open, pleasant expression on your face most of the time. Ending2: [substeps] A smile is one of the positive things about being shy. It makes you feel more at peace in class, and makes others more likely to open up to you. Ending3: It makes you feel like they're getting a good deal from you, which can make you seem more approachable. [substeps] Smiling releases endorphins into your brain that can make you happier and boost your mood. Ending4: You may be even more shy if you don't smile often. Good smiles usually get noticed, and if you put on fake smiles frequently (and often) people will take notice.

Answer format: ending1/ending2/ending3/ending4