Answer: A) Past Perfect.
Explanation for this question is being written.
Answer: C) Had been.
Answer: B) He had completed the project.
Answer: A) Were, had forgotten.
Answer: B) Had caught/took.
Answer: D) Had sent.
Answer: A) Had forgotten.
Answer: D) I had finished my homework.
Answer: D) She had finished her homework before dinner.
Answer: A) Had been identified.
Answer: A) Had scored.
Answer: C) Had drawn.
Answer: B) Had forgotten.
Answer: D) Had run.
Answer: C) My dog had participated for third time.
Answer: A) Had eaten.
Answer: B) Had worked.
Answer: A) Had interviewed.
Answer: B) Past perfect.
Answer: A) Had left.
Answer: A) Had
Answer: C) Had already studied.
Answer: C) HAD GIVEN.
Answer: B) Had + past participle.
Answer: D) Past Perfect.
Answer: D) They had eaten dinner.
Answer: C) Had run.
Answer: B) Past participle.
Answer: D) Had finished.
Answer: C) Had
Answer: A) Had finished.
Answer: B) False
Answer: A) Had found.
Answer: C) Had done.
Answer: C) Had changed.
Answer: A) False
Answer: C) Didn't have; had paid.
Answer: B) Had finished.
Answer: A) Perfect Tenses.
Answer: D) Had left.
Answer: C) Had won.
Answer: A) Had they entered.
Answer: A) Had disappeared.
Answer: B) Had left.
Answer: A) A had never tried.
Answer: C) Had rained; canceled.
Answer: B) HAD BOUGHT.
Answer: A) Had worked.
Answer: A) It's an event that happened before a particular time in the past.
Answer: D) She had gone to the store yesterday.
Answer: B) Had fallen.
Answer: A) Had packed.
Answer: C) Past perfect.
Answer: C) Paid
Answer: D) Had never seen.
Answer: A) Had raised.