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:
Neutrons consist of one up quark and ____ down quarks.
answer:
two

question:
American women are four to ____ times more likely than Asian women to die of breast cancer.
answer:
seven

question:
Physicists now think of light in terms of photons, particles that have ____ mass but carry momentum.
answer:
no