Answer: D) Had discovered.
Explanation for this question is being written.
Answer: C) Had bought.
Answer: B) Had gone.
Answer: A) Hadn't eaten.
Answer: A) The man had not eaten for days before he fainted by the roadside.
Answer: C) Had been eaten.
Answer: A) Past Perfect.
Answer: B) He had watched a scary movie.
Answer: B) Had visited.
Answer: D) Had been finished.
Answer: D) Had shared.
Answer: A) Had switched / made.
Answer: B) Had been.
Answer: A) Had expected.
Answer: C) Had
Answer: D) Had received.
Answer: A) Past perfect tense.
Answer: C) Had followed.
Answer: C) Had sent.
Answer: C) Had listened.
Answer: B) Had left.
Answer: A) Had
Answer: B) Had waited.
Answer: D) Had they studied.
Answer: B) Had practiced.
Answer: D) Had done.
Answer: D) I had been sleeping, came.
Answer: D) Had taken place.
Answer: B) Past Perfect Use: For an action that happened before another past action.
Answer: C) Had gone.
Answer: A) Had gone-.
Answer: C) Had finished.
Answer: B) Had finished.
Answer: A) Had written.
Answer: C) C
Answer: B) Had met.
Answer: C) Had you known.
Answer: C) Had checked.
Answer: C) . had finished.
Answer: C) Had left.
Answer: A) Had worked.
Answer: C) Had been sent.
Answer: A) Had already been sent.
Answer: B) Had already started.
Answer: A) Was destroyed/ will be rebuilt.
Answer: C) Had we finished.
Answer: B) Had eaten.
Answer: B) Had closed.
Answer: B) Had
Answer: D) Had told.
Answer: A) Correct
Answer: C) Collected, had fallen.
Answer: B) By using 'had' + past participle of the main verb.
Answer: C) Had just finished-were clapping.
Answer: A) Had / been.
Answer: D) Had completed.
Answer: D) Had taken.
Answer: B) Had-was working.