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:
Cytochrome oxidase consists of two cytochromes and ____ copper atoms.
answer:
two


question:
Adult clothing is worth about ____ percent of retail and children's clothing a little more.
answer:
ten


question:
Mice become sexually mature in just a couple months and produce about eight litters in ____ year.
answer:

one