Is the following sentence linguistically acceptable?
Which language do you want to hire someone who speaks?

unacceptable

Is the following sentence linguistically acceptable?
That Jason had arrived was obvious infuriated Medea.

unacceptable

Is the following sentence linguistically acceptable?
It is obvious that the more you eat, the less you want.

acceptable

Is the following sentence linguistically acceptable?
That joke never fails to amuse.
acceptable