Answer: B) Had already begun.
Explanation for this question is being written.
Answer: A) Had already been sold.
Answer: C) Had owned.
Answer: B) Had left.
Answer: D) Had known.
Answer: E) Had read.
Answer: C) Hadn't advised.
Answer: C) Had
Answer: B) Past Perfect Tense.
Answer: A) Had gotten.
Answer: A) Had gone.
Answer: B) Had read.
Answer: D) Had read.
Answer: B) Had lived.
Answer: C) Had left.
Answer: B) Had finished.
Answer: C) Had/spoken
Answer: C) Had gone.
Answer: B) Hadn't watched.
Answer: A) Had evaluated.
Answer: D) Had eaten.
Answer: A) Had eaten/ went.
Answer: B) HADN'T
Answer: C) Hadn't bought.
Answer: B) They said, 'We had seen that movie.'.
Answer: A) Past perfect.
Answer: C) Had finished.
Answer: D) Had they hired.
Answer: C) Had taught.
Answer: A) Had
Answer: C) Had lived.
Answer: B) Had had.
Answer: A) When the gladiators had killed the lion, the spectators clapped.
Answer: B) Had done.
Answer: B) Had
Answer: A) Had chosen.
Answer: A) Had happened.
Answer: C) Had done.
Answer: C) Had bought.
Answer: A) Had arrived.
Answer: B) Had established.
Answer: B) Had you studied.
Answer: B) Had worked.
Answer: B) Had been.
Answer: B) We had just sat down to dinner before a fire brokeout in the kitchen.
Answer: B) Had lost.
Answer: C) Had come, had been.
Answer: D) Had mastered.
Answer: C) Had baked.
Answer: C) Had never met.
Answer: A) Had answered.
Answer: A) Had changed.