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:
Cats have five toes on their front paws, but only ____ touch the ground when walking.
answer:
four


question:
Irrigation can increase land productivity by three to ____ times, especially in the north.
answer:
seven


question:
Germanium is in column four in the periodic table and has ____ valence electrons.
answer:

four