instruction:
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".
question:
Which city and to which conference did Bill go to?
answer:
unacceptable


question:
In the book, he talks about his ups and downs at school.
answer:
acceptable


question:
He has been must being interrogated by the police at that very moment.
answer:

unacceptable