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: Mental illness enters the lives of at least one in ____ families.

Answer: four


Question: Spiders have eight legs and usually have ____ eyes.

Answer: eight


Question: Stable nitrogen has seven protons and ____ neutrons.

Answer:
seven