TASK DEFINITION: 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".
PROBLEM: The trainer fed the steaks all to the lions.

SOLUTION: acceptable

PROBLEM: That the march should go ahead and that it should be cancelled have been argued by different people at different times.

SOLUTION: acceptable

PROBLEM: Which celebrity did he mention that he had run into?

SOLUTION:
acceptable