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:
Sexual maturity is reached at ____ years, and females calve every other year.
answer:
four


question:
Elephants give birth to ____ calf every four to nine years on average.
answer:
one


question:
Most species have ____ fingers on the front limbs and five toes on the hind.
answer:

four