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".

I insist on seeing through all the students who had started out the term in my class.
unacceptable

I have some papers to try to finish grading.
acceptable

Any zebras can't fly.

unacceptable