After suffering an injury during the match against Federer, Nadal has required surgery ____ his right knee.
A. on
B. at
C. to
D. in

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Which sentence does NOT use a colon correctly?
A. The coach quizzed the team on: techniques, strategies, and goals.
B. Snoopy, the dog created by Charles M. Schulz, once said this in a cartoon: “Yesterday I was a dog. Today I’m a dog. Tomorrow I’ll probably still be a dog. Sigh! There’s so little hop for advancement.”
C. Attention park users: Littering now carries a fine of two hundred dollars.
