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: Pathologists study four to ____ years after medical school and their postgraduate training.

Answer: five


Question: Girls have ____ ovaries.

Answer: two


Question: Hummingbirds feed throughout the day, at intervals as often as every ____ to twelve minutes.

Answer:
eight