Given a sentence, fill out the missing word with a 'no' or a number (between zero and ten). You should write the numbers with english alphabet, like: four instead of 4.
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Question: Box turtles are mature and capable of mating at ____ years old.

Answer: five


Question: Mature birds boast a wing span of ____ feet.

Answer: six


Question: Antibiotic prophylaxis is warranted only in patients with ____ or more exacerbations per year.

Answer:
four