Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions.

Question 31. Some researchers declare that their experiments only have a negligent effect on

                                                      A                                                                      B

animals, but animal rights activists do not share their viewpoint.

                                   C                                D

Question 32. The museum is open to the public, but they are closed on weekends and holidays.

                                           A               B                       C                D

Question 33. Many people think that manual workers have been replaced by robots in the future.

                                              A               B                               C                              D