Final answer:
The word that completes the sentence is 'menos.' It means 'less.'
Step-by-step explanation:
The word that completes the sentence is menos.
Tengo más menos diez primos.
This sentence translates to "I have less than ten cousins." In Spanish, the word "menos" means "less." In this sentence, it is used to indicate that the number of cousins is less than ten.
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