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:
Some species have more than ____ pairs of walking legs.
answer:
four


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


question:
Men produce ____ types of sperm in equal amounts.
answer:

two