instruction: Is the next sentence syntactically and semantically acceptable?

Is whether he played the piano known?
OPTIONS:
- unacceptable
- acceptable

response: unacceptable

instruction: Is the next sentence syntactically and semantically acceptable?

Who do you think that Bill likes?
OPTIONS:
- unacceptable
- acceptable

response: acceptable

instruction: Is the next sentence syntactically and semantically acceptable?

He did not leave.
OPTIONS:
- unacceptable
- acceptable

response: acceptable

instruction: Is the next sentence syntactically and semantically acceptable?

Gabrielle's mother is an axe murderer.
OPTIONS:
- unacceptable
- acceptable

response:
acceptable