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

Q: Essential oils have a non-toxic, residual effect of up to five months from just _ application.

A: one
****
Q: Pangolins walk on all _ of their stout limbs, which are adapted for digging.

A: four
****
Q: Carbon is able to bond with up to _ other elements.

A:
four
****