The woman .................. to the headmaster will make a speech about protecting the environment.

A. talks                     B. will talk                C. talking                             D. talked

5. Do you mind if I .................... the front seat of the taxi?

A. sit                         B. sat                        C. sitting                               D. to sit

6. It is a ..................... drive from here to the city center.

A. twenty - minutes                                     B. twenty minutes       

C. twenty-minute                                         D. twenty minute