Answer: C) I gave him a present that was very nice but also very expensive.
Explanation for this question is being written.
Answer: D) Whose
Answer: D) To combine sentences and ideas for clarity and to avoid repetitveness.
Answer: B) The woman whose car was stolen is my neighbor.
Answer: C) Relative Clause (RC).
Answer: B) That
Answer: D) Where
Answer: D) A& B.
Answer: C) Whose
Answer: D) Which
Answer: B) Where
Answer: C) Plants, which.
Answer: B) Where / where.
Answer: C) Which
Answer: A) Physical presence.
Answer: C) Where
Answer: E) Whose
Answer: D) That
Answer: D) In which.
Answer: C) That
Answer: A) Whose
Answer: A) Its use in the relative clause.
Answer: C) All of whom.
Answer: C) On which the argument centered.
Answer: C) In which.
Answer: B) None
Answer: C) Who
Answer: D) The last of which.
Answer: D) In
Answer: A) Right
Answer: D) That we have.
Answer: D) Whose OR where OR when.
Answer: A) To specify nouns in relative clauses.
Answer: A) At which.
Answer: A) The book that you gave me is interesting.
Answer: B) Whose