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Correct Answer: A) Whose.
Correct Answer: B) Who.
Correct Answer: D) Where.
Correct Answer: C) Whom.
Correct Answer: A) Which.
Correct Answer: C) When.
Correct Answer: A) No comma needed.
Correct Answer: B) Whom.
Correct Answer: A) A whose.
Correct Answer: C) Who.
Correct Answer: C) Whose.
Correct Answer: A) That.
Correct Answer: B) That fell last night caused a traffic jam.
Correct Answer: C) WHICH.
Correct Answer: C) These people who work in the office are very friendly.
Correct Answer: A) No, because it is a non defining clause.
Correct Answer: E) Which.
Correct Answer: D) Who.
Correct Answer: A) The letter which I posted three days ago hasn't arrived yet.
Correct Answer: A) Whom.
Correct Answer: A) There is a sheep whose wool is black.
Correct Answer: B) A whose.