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: Atoms are extremely small, on the order of a few ____ billionths of a meter.

Answer: ten


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

Answer: four


Question: Casein proteins have three major types, and all ____ appear in every mammal species on Earth.

Answer:
three