In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.

Q: Porcine insulin has _ different amino acid and bovine insulin has three different amino acids.

A: one
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Q: Eagles attain their adult plumage at _ or five year of age.

A: four
****
Q: Peasants spend their days laboring in the fields, and usually work a _ day week.

A:
seven
****