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 animals have only ____ or three chambers .
answer:
two


question:
Most dens are oval shape, six to ____ feet long and about six feet in height and width.
answer:
nine


question:
Natural gas contains four atoms of hydrogen for every ____ atom of carbon.
answer:

one