(A) I was delighted with the present you gave me.
Explanation: The correct preposition to use with "delighted" when referring to a thing (e.g., a gift) is with.
Correct phrase: delighted with something
(B) The letter I wrote was full of mistakes.
Explanation: The correct expression is "full of" — it always takes the preposition of.
Correct phrase: full of something
(C) A strange thing happened to me a few days ago.
Explanation: The verb "happen" uses the preposition to when referring to the person affected.
Correct phrase: happened to someone
(D) I hope you succeed in getting the job you want.
Explanation: We use "succeed in" when followed by an action (verb + ing form).
Correct phrase: succeed in doing something