—Who cleaned the blackboard yesterday, Dick?

—John ______.[ ]

A. cleaned

B. does

C. did

D. is

— Would you like me _____ the radio a bit?

— No, it's all right. I'm used _____ with the radio _____.  [ ]

A. to turn down; to work; on

B. turning down; to working; on

C. turning down; to working; off

D. to turn down; to working; on