Answer: C) The crown was robbed by the thief.
Explanation for this question is being written.
Answer: B) Passive Voice.
Answer: C) My sister mailed the letter.
Answer: B) Was hit.
Answer: B) The ship was prepared for departure by the crew.
Answer: B) Passive
Answer: D) Were allowed to.
Answer: A) Were sent.
Answer: A) Was built.
Answer: C) Was caused.
Answer: B) Many singers were awarded by the Grammys.
Answer: A) Active
Answer: A) The mouse was chased by the cat.
Answer: A) Were eaten.
Answer: A) The children were taken to the circus.
Answer: D) Were written.
Answer: C) Was added.
Answer: C) The house was bought by my father.
Answer: B) Was liked.
Answer: C) Simply painted rocks were found by researchers from 10,000 years ago.
Answer: A) Passive
Answer: B) Was bitten.
Answer: B) A beautiful portrait was painted by the artist.
Answer: A) The boy broke the window.
Answer: C) Done
Answer: A) The bridge was built in 1990.
Answer: D) Much was learned.
Answer: A) It seems that the office was cleaned on Tuesday.
Answer: D) My coffee mug was taken from the kitchen yesterday.
Answer: A) Was sold.
Answer: C) Placed
Answer: C) The Harry Potter series were written by J.K. Rowling.
Answer: D) The letter was written by Sarah.
Answer: A) The car was driven by Mrs. Tan.
Answer: B) The room was cleaned by them.
Answer: C) A new checking account was open.
Answer: B) Was given.
Answer: C) Was discovered.
Answer: C) Was founded.
Answer: C) Took
Answer: B) Passive voice.
Answer: C) Was/by
Answer: B) Was solved.
Answer: B) The notice was removed by them.
Answer: A) Active voice.
Answer: C) Was passed.