Answer: B) It+be(past tense)+past participle.
Explanation for this question is being written.
Answer: D) It is believed that life will be better in 2050.
Answer: C) Both A and B.
Answer: D) It is said that it will rain tomorrow.
Answer: A) It is said that Tom Yum Kung is popular.
Answer: B) Se + verb in the 3rd person singular or plural form.
Answer: A) The results will be announced.
Answer: D) Bill Gates is said.
Answer: B) It is said that the Vikings discovered America before Columbus.
Answer: D) It is believed that .
Answer: B) Three men are said to have been arrested after the explosion.
Answer: C) It is thought that bats are scary.
Answer: B) Is known.
Answer: B) Is said.
Answer: C) Is thought.
Answer: A) It removes personal opinions from the text.
Answer: D) Is said, is believed, is known, is thought, is reported.
Answer: D) Passive voice sentences.
Answer: A) My aunt is said to have been born in London.
Answer: A) Alternative medicine is believed to be becoming very popular.
Answer: B) It is believed that.
Answer: A) The voice behind the work.
Answer: A) It is considered by many that Paris is the most romantic city in Europe.
Answer: C) Sentence 3.
Answer: D) It creates an impersonal, objective tone.
Answer: B) Noun + is/are + verb (past participle) + to + bare infinitive or perfect infinitive.
Answer: D) You are said to have done that.