instruction: Is the next sentence syntactically and semantically acceptable?

A policeman walked in at 11, and at 12, a fireman.
OPTIONS:
- unacceptable
- acceptable

response: acceptable

instruction: Is the next sentence syntactically and semantically acceptable?

The boy's uncle and aunt were kissing.
OPTIONS:
- unacceptable
- acceptable

response: acceptable

instruction: Is the next sentence syntactically and semantically acceptable?

John disappeared.
OPTIONS:
- unacceptable
- acceptable

response: acceptable

instruction: Is the next sentence syntactically and semantically acceptable?

Marble carves easily.
OPTIONS:
- unacceptable
- acceptable

response:
acceptable