Final answer:
The best translation of the sentence "I'm looking for a pencil" is "Busco un lápiz" in Spanish.
Step-by-step explanation:
The best translation of the sentence "I'm looking for a pencil" is "Busco un lápiz". In Spanish, the verb "buscar" means "to look for" and the article "un" is used to mean "a" or "one". Therefore, the correct translation is "Busco un lápiz".
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