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: Hearing is acute by three or ____ weeks and kittens learn to determine what sounds mean.

Answer: four


Question: Most bioluminescence is blue for ____ reasons.

Answer: two


Question: Ants comprise ____ main castes, which have different roles, workers, queens and males.

Answer:
three