Which of the following is NOT a sentence?

(A) Why are such rumours spread?
(B) The Story of the accident was being told.
(C) You did not fulfil.
(D) I did not make fun of him.

Answer: (A) Why are such rumours spread? 

Which of the following is a correct sentence?

(A) I am surprised on your behaviour.
(B) I am surprised at your behaviour.
(C) I am surprised over your behaviour.
(D) I am surprised in your behaviour.

Answer: (B) I am surprised at your behaviour.