Find one error in the sentences

Find one error in the sentences (1 pts)

1. “Could you mind sitting in the front seat of the taxi?” “No problem”

A                     B                               C                                   D

2. When I will meet her tomorrow, I will invite her to my birthday party

       A       B                                        C                     D

3. I always keep the window open in order to let the fresh air on.

A                                 B                     C                        D

4. Reduce means not to buying the products which are overpackaged

A                B                          C                                 D