TASK DEFINITION: In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.
PROBLEM: Cluster flies are covered with fine golden hairs and have _ stripes on the thorax.

SOLUTION: no

PROBLEM: Ostrichs only have _ toes, and one toenail.

SOLUTION: two

PROBLEM: Repentance has reference to _ classes of sins, according to their sources.

SOLUTION:
three