The word that best completes the sentence is "Desventajas". Hence the complete sentence should read: "
Las comunidades en línea tienen muchas ventajas, pero es claro que hay Desventajas también. Es importante tener cuidado.
What is a complete sentence?
A full sentence must include a subject, a verb, and an object—a minimum of three items. Usually, the subject is a noun or a pronoun.
Additionally, since all verbs require a subject, there must be a verb if there is a subject. The item that the subject of a sentence is acting upon is known as the sentence's object.
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