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:
Plants produce seed at ____ years of age.
answer:
eight


question:
Some rusts produce up to ____ different spore forms.
answer:
five


question:
Females generally give birth by age ____ to eleven in captivity and thirteen to fifteen in the wild.
answer:

ten