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.
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Question: International mail consists of ____ categories of mail.

Answer: three


Question: Cesarean section are three to ____ times more likely for pregnant women with diabetes.

Answer: four


Question: Water consists of two hydrogen and ____ oxygen atom.

Answer:
one