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

Q: Triaxial fabric is woven with _ sets of yarn whose intersections form equilateral triangles.

A: three
****
Q: Several countries appear to have _ islands at all.

A: no
****
Q: Most school aged children pass at least three stools per week, with an average of _ stool per day.

A:
one
****