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:
Yellow fever begins suddenly after an incubation period of three to ____ days.
answer:
five


question:
Autism affects ____ times as many males as it does females.
answer:
three


question:
Sexual maturity is reached at ____ years of age, and most fish die by age six.
answer:

three