This is a bit delayed, but here is my marking highlight for the previous exams...(this photo is proof that I do occasionally mark, for all those doubters)
I took a photo of the actual text, but decided to type it instead - the handwriting is distinctive, and I don't want to embarrass anyone. But this is really an excellent, creative, thoughtful and intelligent wrong answer. Love it!
Q: What does fleet of foot mean? (Context was an article about endangered cheetahs)
A: This phrase means there were lots of cheetahs walking together all in a herd, and when you look you see a large amount (sic) of feet.
Signing off - all day chess tournament today!
PS if you're wondering why 'amount' is incorrect, 'feet' are countable and should therefore be refered to as 'number'. 'Amount' is for uncountable quantities (sugar, grass, milk...). Grammar lesson over!