instruction: Is the next sentence syntactically and semantically acceptable?

Dulles suspected everyone who Angleton did.

response: acceptable

instruction: Is the next sentence syntactically and semantically acceptable?

He has left.

response: acceptable

instruction: Is the next sentence syntactically and semantically acceptable?

It is tough to play sonatas on this violin.

response: acceptable

instruction: Is the next sentence syntactically and semantically acceptable?

Were you surprised that he stole the watch?

response:
acceptable