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: On which table and under which flower pot did John put the keys?

SOLUTION: acceptable

PROBLEM: A choir sang in the church.

SOLUTION: acceptable

PROBLEM: Is putting the book in the box.

SOLUTION:
unacceptable