Answer:
"Seriously, though, he's doing a grand job!" British TV personality David Frost sarcastically remarked.
Explanation:
When using quotation marks, it's important that all punctuation at the end of the sentences are within the quotation marks.
In the given problem, the exclamation point (!) is outside of the quotation mark, which is wrong. It should be inside the quotation mark like so:
"Seriously, though, he's doing a grand job!" British TV personality David Frost sarcastically remarked.
Other than that error, though, the sentence is fine.
Hope this helps!
