(2013·高考山东卷)—How far can you run without stopping?

—________.I’ve never tried.

A．Don’t mention it?? B．That’s all right

C．I have no idea? D．Go ahead

（山东卷31）. Your house is always so neat—how do you ______ it with three children?

  A. manage         B. serve        C. adapt           D. construct

（山东卷32）. Helping others is a habit, _______ you can learn even at an early age.

  A. it              B. that          C. what           D. one

（山东卷21）. —Do you think you could do without help?

   —______. This is not the first time for me.

  A. Take care       B. Hurry up     C. Not exactly     D. Don’t worry