Answer:
Use a spelling word to complete the sentence.
His cavity was very infectious.
Step-by-step explanation:
These are the spelling words. The correct answer among them is cavity since it is the only word that names a disease.
ammunition
ascension
brevity
cavity
creation
denomination
description
detention
extension
fission
gravity
hypertension
illustration
imagination
institution
justification
levity
pension
permission
petition
repetition
submission
substitution
superstition