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: Couples spend ____ billion dollars a year on infertility treatments.

Answer: two


Question: Fats come in ____ different forms saturated and unsaturated.

Answer: two


Question: Mountain sheep have ____ sharp teeth at the front of the mouth.

Answer:
eight