Smile, it's contagious.
Meaning: Smiling is a way to spread happiness to others, just like a contagious disease spreads from person to person.
Choice of Words: Smile is an expression of happiness or pleasure. It is a pronoun used to refer to a thing or person that has already been mentioned. Is is a verb that means to exist or to be. Contagious means to be able to spread from one person or thing to another.
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