Each of the following sentences has one mistake. Identify the mistake by writing the letter A, B, C or D on the answer sheet

Each of the following sentences has one mistake. Identify the mistake by writing the letter A, B,  C or D on the answer sheet.

16. We can’t swim in this river because of the water is awfully polluted

                         A                             B                         C                    D

17. You know where Andrew is , didn’t  you ?

                A         B                  C    D

18. A lot of  new schools  were built  recently.

            A            B                   C               D

19. Tom used to going to school by bus. Now he goes by bike.

                                  A                        B                        C          D

20. Mrs. Stevens, along with her cousins from New Mexico, are planning to attend the festivities.

                  A          B                                         C                       D