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

[EX Q]: Diarrhea is an illness that kills _ and one-half million children per year.
[EX A]: three

[EX Q]: Dairy cows live for _ generations, calve and produce normal milk on a protein-free diet.
[EX A]: six

[EX Q]: Women give birth to dead babies after pregnancies of only _ months.
[EX A]:
four