10. The storm has delayed the 11.20 flight to London.
     A. The 11.20 flight has been delayed to London by the storm.
     B. The 11.20 flight to London has been delayed by the storm.
     C. The 11.20 flight to London has delayed the storm.
     D. All are correct.
11. People think that many people were killed in the accident. 
    A. Many people are thought to be killed in the accident.
    B. Many people thought to have been kill in the accident.
    C. Many people think to have been killed in the accident.
    D. Many people are thought to have been killed in the accident.
12. It is said that he speaks English very well. 
   A. It is said to speak English very well.             B. He is said to speak English very well. 
   B. He is said to have spoken English very well.     D. People said that he speaks English very well.