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: Cats have five toes on their front paws, but only ____ touch the ground when walking.

Answer: four


Question: Object permanence is seen in children ____ to twelve months old .

Answer: eight


Question: T cells require ____ signals to become activated.

Answer:
two