adverbs

[Anonymous]

Are these sentences correct in agreement?
These kinds of widgets work well.
It is an uninteresting essay that I could scarcely believe that a university student wrote it.
He is a CPA, and his sister in a MD.

[MikeNewYork]

Are these sentences correct in agreement?

These kinds of widgets work well. [yes]

It is such an uninteresting essay that I could scarcely believe that a university student had written it.

He is a CPA, and his sister is an MD.

[I would omit the comma in the third because of the short length of the clauses.]