(     )21. —Would you like to climb mountains with me this Sunday?

—I’d love to.But I______play table tennis against Class Three.

A. am going            B. am going to        C. am          D. going to

(     )22. —Do you like swimming?

          —Yes,swimming is a good way______fit.

  A. keep         B. to keep    C. keeping        D. keeps

(     )23.—______do you prefer, walking or running?

  —I like running better.

         A.What       B. How     C. When          D. Which

(     )24.The shirt looks very nice. I guess it is______100 yuan.     

          A. at first          B. at most

          C. at least          D. at last