Find the underlined part that needs correction in each of the following questions.
1. Look at the dark clouds in the sky. It will rain heavily. 
   A                   B                   C           D
2. I think people are going to have special flying cars.   
   A             B            C                  D
3. Ben is interested in information technology and he usually listens to podcasts in this topic.     A                           B                                        C                              D
4. Because of their high prices, interaction whiteboards are not common nowadays.
  A                       B                C                                            D
5. The mathematics is considered as a difficult subject by many students.

                   A                     B                       C                                      D
6. When you’re preparing for a holiday, pack clothes that are suitable for a place where you’re going.A B C D
8. I am crazy about reading the history books        
A         B         C       D
9. While I walked across the campus the other day, I met my old friend John.
A     B   C   D