instruction: Is the next sentence syntactically and semantically acceptable?

Captain Oates died in order to save his comrades.

response: acceptable

instruction: Is the next sentence syntactically and semantically acceptable?

John ate a carrot and Mary did so a radish.

response: unacceptable

instruction: Is the next sentence syntactically and semantically acceptable?

We have many graduate students but this year the graduate director met with any student in the graduate program individually to discuss their progress.

response: unacceptable

instruction: Is the next sentence syntactically and semantically acceptable?

Jason was killed by Medea.

response:
acceptable