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

[EX Q]: Most amphibians reach maturity at _ or four years.
[EX A]: three

[EX Q]: Climatic regions Contrasts between the interior and the coasts produce _ main climatic regions.
[EX A]: six

[EX Q]: Osteoporosis is a disease that hits women _ times as frequently as men.
[EX A]:
three