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: Most cats have five toes on each front paw, but only ____ toes on each back paw.

Answer: four


Question: Grasshoppers begin egg laying one to ____ weeks after becoming adults.

Answer: three


Question: Fission occurs when ____ flatworm splits into two flatworms.

Answer:
one