instruction: Is the next sentence syntactically and semantically acceptable?

That our perspectives had changed over the years and the issues we had worked on as students were the topics of discussion.
OPTIONS:
- unacceptable
- acceptable

response: acceptable

instruction: Is the next sentence syntactically and semantically acceptable?

I believed she was pregnant
OPTIONS:
- unacceptable
- acceptable

response: acceptable

instruction: Is the next sentence syntactically and semantically acceptable?

Fred watered the plants flat.
OPTIONS:
- unacceptable
- acceptable

response: acceptable

instruction: Is the next sentence syntactically and semantically acceptable?

John went to the store.
OPTIONS:
- unacceptable
- acceptable

response:
acceptable