instruction: Is the next sentence syntactically and semantically acceptable?

Everyone rumored that he was on his way out.

response: unacceptable

instruction: Is the next sentence syntactically and semantically acceptable?

The bears sniff

response: acceptable

instruction: Is the next sentence syntactically and semantically acceptable?

A large ship appeared on the horizon.

response: acceptable

instruction: Is the next sentence syntactically and semantically acceptable?

He planted the garden with roses last November.

response:
acceptable