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

[Q]: Germs have _ means of locomotion execpt to attach themselves to particles of dust.
[A]: no


[Q]: Most polyps cause no symptoms and take five to _ years to change to cancer.
[A]: seven


[Q]: Psyllium usually is taken one to _ times daily as a laxative.
[A]:
three