Is the following sentence linguistically acceptable?
That he is clever is eager to be obvious.

unacceptable

Is the following sentence linguistically acceptable?
Ron wanted to wear a tuxedo to the party, but wear a tuxedo to the party Caspar couldn't decide whether to.

unacceptable

Is the following sentence linguistically acceptable?
It was an explosion that you heard.

acceptable

Is the following sentence linguistically acceptable?
a stone blocked the road.
acceptable