You're given a sentence and your task is to classify whether the sentence is acceptable or not. Any sentence which is grammatically correct, has a naturalistic text, is written by a native speaker and which minimizes superfluous content is acceptable, otherwise unacceptable. If the sentence is acceptable then write "acceptable", otherwise "unacceptable".

Q: Mary questioned Joe's desire to eat cabbage, but only after I had questioned Sally's desire to.

A: unacceptable
****
Q: I've never seen him eats asparagus.

A: unacceptable
****
Q: Who is he reading a book that criticizes?

A:
unacceptable
****