instruction:
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.
question:
Spermatogenesis creates ____ sperm of equal size.
answer:
four

question:
Female mealybugs have only ____ nymphal stages.
answer:
three

question:
Most people buy a new car every ____ to ten years depending on their income and needs.
answer:
three