1. When you leave the classroom£¬don't forget to turn off the lights and____ the door.

A. lock                                 B. ring 

C. knock                                D. push

2. The students were____ two groups to play the game yesterday afternoon.

A. prevented from                       B. changed into

C. brought from                         D. divided into

3. —Listen£¡____ is knocking at the door.

—Who is it? Let me have a look.

A. Somebody                             B. Everybody

C. Anybody                              D. Nobody