instruction: Is the next sentence syntactically and semantically acceptable?

My brother is an Einstein at maths.
OPTIONS:
- unacceptable
- acceptable

response: acceptable

instruction: Is the next sentence syntactically and semantically acceptable?

Shelly loves who?
OPTIONS:
- unacceptable
- acceptable

response: acceptable

instruction: Is the next sentence syntactically and semantically acceptable?

The man I think that chased Fido returned.
OPTIONS:
- unacceptable
- acceptable

response: unacceptable

instruction: Is the next sentence syntactically and semantically acceptable?

On this table, they put a lamp, and on that table, a radio.
OPTIONS:
- unacceptable
- acceptable

response:
acceptable