instruction: Is the next sentence syntactically and semantically acceptable?

The bed was fallen on by the dust.
OPTIONS:
- unacceptable
- acceptable

response: unacceptable

instruction: Is the next sentence syntactically and semantically acceptable?

John wants to find a solution better than Christine's.
OPTIONS:
- unacceptable
- acceptable

response: acceptable

instruction: Is the next sentence syntactically and semantically acceptable?

Who left Bill.
OPTIONS:
- unacceptable
- acceptable

response: acceptable

instruction: Is the next sentence syntactically and semantically acceptable?

Bill sent Tom a package.
OPTIONS:
- unacceptable
- acceptable

response:
acceptable