Final answer:
The word that completes the sentence is 'bonito' as it matches the descriptions provided in the previous sentences.
Step-by-step explanation:
The word that correctly completes the sentence is bonito.
The adjective bonito means 'beautiful' in Spanish. It matches the description of the colorful mountains, the blue sky, the transparent water, and the green trees. Therefore, the most appropriate word for the sentence is bonito.
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