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

[Q]: Nymphs feed for five to _ weeks before entering the adult stage.
[A]: eight


[Q]: Armaments manufacturers use lithium to produce tritium in _ ways.
[A]: two


[Q]: Gerbils get reproductive when they reach sexual maturity at the age of _ months.
[A]:
three