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:
Copper has ____ naturally occurring isotopes.
answer:
two


question:
Studies show that childhood obesity is epidemic and that one in ____ children is overweight.
answer:
five


question:
Men are three to ____ times more likely to commit suicide than women.
answer:

six