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: Every isometry is the composition of one, two, or ____ reflections .

Answer: three


Question: Most people become sick ____ to seven days after infection.

Answer: two


Question: Fireflies combine ____ special substances in their photic organs to make light.

Answer:
three