There is one mistake in each of the following sentences. Find the mistake and write your answer A, B, C or D

IV. There is one mistake in each of the following sentences. Find the mistake and write your answer A, B, C or D. (1 point)
1. Do you know how many people  are there in her family?
     A            B                            C           D
2. It’s ten o’clock. My father unloads the vegetables.
      A             B                             C                   D
3. My class  has a picnic  two a year.
           A         B                  C        D
4. My mother needs to buy a bottle of cooking oil and five hundred gram of beef.
                          A        B                    C                                           D
5. My brother has a lot of homewoks to do this evening.
                         A      B            C                      D