—Mum,         shall we have lunch?
—We will have it when your dad        .

—        did you work out the problem in such a short time?
—With Mr. Li’s help.

—      is your father? Does he still work as an engineer?
—Yes, he has been an engineer for thirty years.

—W____ bag is this?
—It’s mine.

—     does your father go to the fitness center?
—He exercises there twice a week.

—      can you finish your homework?
—In about one and a half hours.

     is it from your home to school?

—      do you study for a test?
—I study by working with my classmates.

This math problem is too difficult. Can you show me        , George?

—What kind of teachers do you like?
—      .