26. You should ask Bob ________ his own clothes. He is ten years old now.

   A. wash                         B. washes                     C. washing                   D. to wash

27. It’s sports time. Most ________ students in Class 1 are playing football on the playground.

   A. boy                           B. boys                        C. boy’s                       D. boys’

28. ---Must we finish the work today?

   ---________. We have something else to do tomorrow.

   A. Yes, we can                                                   B. No, we can’t    

   C. Yes, we must                                                 D. No, we needn’t