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

[EX Q]: Ostrichs only have _ toes, and one toenail.
[EX A]: two

[EX Q]: Digoxin works in _ ways.
[EX A]: two

[EX Q]: Nymphs feed for at least a month and develop through _ instars before becoming adults.
[EX A]:
four