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

[EX Q]: Prostate cancer has _ symptoms in the early stages.
[EX A]: no

[EX Q]: Most solenoids have _ tabs with holes for mounting.
[EX A]: two

[EX Q]: Reciprocity involves dialogue and communication among _ persons or groups.
[EX A]:
two