Each item in this exercise consists of a word followed by a sentence in which you must supply the appropriate form to fill in the gap. For each item, say whether the word you supply contains a...

Each item in this exercise consists of a word followed by a sentence in which you must supply the appropriate form to fill in the gap. For each item, say whether the word you supply contains a distinct allomorph of the related word. If so, do they differ in terms of spelling, pronunciation or both?

a. (confess) The criminal made a _______ to the police.

 b. (secret) The minister was sworn to _______ about the plan.