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: Luminosity decreases by almost four orders of magnitude in approximately ____ million years.

Answer: five

Question: Cytochrome oxidase consists of two cytochromes and ____ copper atoms.

Answer: two

Question: Full immunity occurs about four weeks after injection and lasts for about ____ months.

Answer:
five