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: Harpists spend ninety percent of their lives tuning their harps and ____ percent playing out of tune.

Answer: ten


Question: Photosynthesis has ____ main sets of reactions.

Answer: two


Question: Acetylene is a linear molecule, all ____ atoms lying along a straight line.

Answer:
four