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

[EX Q]: Dialogue is _ sides working together toward a common understanding.
[EX A]: two

[EX Q]: People are born with _ kidneys.
[EX A]: two

[EX Q]: Disasters have _ boundaries and they strike at all races, all creeds, all sizes of people.
[EX A]:
no