Answer: D) Had, boiled.
Explanation for this question is being written.
Answer: B) Had seen.
Answer: B) Had walked.
Answer: B) Had already finished.
Answer: C) Past Perfect Tense.
Answer: C) Had lived.
Answer: B) Had lived.
Answer: A) Had
Answer: B) Had
Answer: C) Had finished.
Answer: D) Hadn't been invented.
Answer: D) Had rained.
Answer: B) Had arrived.
Answer: A) Had lived.
Answer: D) Had cooked.
Answer: B) Had fled.
Answer: D) Had never met.
Answer: A) Had finished.
Answer: B) Had broken.
Answer: D) Had consumed.
Answer: B) Had started.
Answer: B) Had been raised.
Answer: B) Had finished.
Answer: C) Past perfect tense.
Answer: B) Had escaped.
Answer: D) Had been repaired.
Answer: A) Past perfect tense.
Answer: A) Had come.
Answer: A) Had started.
Answer: B) Had asked / would have.
Answer: C) Had met.
Answer: C) Had left.
Answer: A) Had not.
Answer: B) Had, been.
Answer: A) Got/ had left.
Answer: B) Had read.
Answer: B) Had gone.
Answer: D) When we want to show an action that occurred before another action in the past.
Answer: C) Had
Answer: A) Had already seen.
Answer: D) Had destroyed.
Answer: D) Had lost.
Answer: B) Had left.
Answer: D) Had worked.
Answer: B) Had closed.
Answer: B) Error occurred before the moment of realization.
Answer: D) I had done x.
Answer: B) Past perfect.
Answer: D) Met, hadn't known.
Answer: B) Had brought.
Answer: A) Hadn't been.
Answer: B) Had forgotten.
Answer: D) Had reviewed.
Answer: D) Had
Answer: B) Had told.