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:
Mollusks have one or ____ hearts.
answer:
two


question:
Most health professionals recommend approximately ____ hours of sleep each night.
answer:
eight


question:
Female devils are occupied with raising their young for all but approximately ____ weeks of the year.
answer:

six