Answer: B) Arrived, had forgotten.
Explanation for this question is being written.
Answer: B) Past Perfect Tense.
Answer: C) Had finished.
Answer: A) Decided / had written.
Answer: D) Had had / sold.
Answer: A) Felt, had eaten.
Answer: C) Past perfect.
Answer: A) Got, had left.
Answer: B) Past perfect.
Answer: B) Had learnt / started.
Answer: B) Had / sent.
Answer: B) Had cleaned; visited.
Answer: A) Went
Answer: A) Was found.
Answer: C) Have had.
Answer: A) Correct
Answer: A) Describe an action that happened before another action in the past.
Answer: A) Came/ had done.
Answer: B) Has been.
Answer: C) Had not seen/watched.
Answer: B) False
Answer: A) Had written-explained.
Answer: B) Met
Answer: A) Arrived / hadn't arrived yet.
Answer: A) Wrote
Answer: A) Entered, had left.
Answer: C) To show actions that happened before another past action.
Answer: A) Left
Answer: C) Had drawn/had said/said.
Answer: B) Had visited / went.
Answer: B) Had started-arrived.
Answer: B) Moved / had sold.
Answer: D) Told-had served.
Answer: A) Moved
Answer: B) Woke up / hadn't arrived.
Answer: B) Mowed / had picked.
Answer: B) Hadn't flown; was.
Answer: A) He wrote articles.
Answer: D) Had just cleaned, came.
Answer: A) Is mainly used to express actions that occurred before others that took place in the past.
Answer: A) Had already left / arrived.
Answer: A) Were, had forgotten.
Answer: A) Past Perfect Simple.
Answer: A) 'Was eaten' indicates a completed action in the past.
Answer: A) Had broken.
Answer: C) Phoned-had gone.
Answer: C) Had / went.
Answer: A) Had seen-fell.
Answer: C) Action that has already occurred before a specific point in the past.
Answer: C) Had painted / came.
Answer: B) Said / had done.
Answer: A) Called
Answer: C) Has studied(c).
Answer: D) If she had taken the bus, she would have been on time.
Answer: B) The ground was wet because it had rained overnight.
Answer: B) Moved
Answer: D) Moved
Answer: A) I had packed my bag when I left for the airport.
Answer: A) Doing
Answer: C) Went-hadn't enjoyed.
Answer: A) Had already // (b) arrived.