Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction

Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in the following question from 6 to 10.
Question 5: My sister enjoys read about wild animals and natural mysteries.        
                                        A         B                     C      D
Question 6: Mr. Thach  who sing English songs very well is my teacher of English.         
                          A                   B                          C                    D
Question 7: The boy was so boring with the film that he couldn’t sleep last night.   
                                    A                 B                                            C                      D