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:
Heart attacks occur most often around ____ in the morning.
answer:
five


question:
Most people change careers ____ to seven times during the course of their life's work.
answer:

four