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

Example Input: Black women giving birth have a four to _ higher rate of mortality than white women do.
Example Output: one

Example Input: Women devote their lives to raising families of six, seven and _ children.
Example Output: eight

Example Input: Embryos develop to first-stage larvae within about _ weeks.
Example Output:
three