Choose the most correct answer

EXERCISES
I.    Choose the most correct answer:
7. People believe that hundreds of homeless children are living on the streets.
      A. It is believed that hundreds of homeless children are living on the streets.
      B. Hundreds of homeless children are believed to be living on the streets.
      C. Hundreds of homeless children believe to be living on the streets.
      D. A & B are correct.
8. Does Professor Jackson teach that course?
    A. Is that course teach by Prof. Jackson?          
    B. Has that course been taught by Professor Jackson?
    C. Is that course taught by Professor Jackson?    
    D. Was that course taught by ProfessorJackson?
9. People said that Tom stole that bicycle.
    A. Tom is said to steal that bicycle.    B. Tom is said that to steal that bicycle.
    C.  Tom was said to steal that bicycle.    D. Tom were said to steal that bicycle.
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.