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".

They widely believed that John was ill.
acceptable

I am anxious that you should arrive on time.
acceptable

They may grow as much as six feet high.

acceptable