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: Some tropical species have ____ or three generations per year.

Answer: two


Question: Many people have ____ symptoms until they suffer chest pains or a heart attack.

Answer: no


Question: Female bears reach sexual maturity around ____ and a half years of age.

Answer:
four