22. —Hi, Brown. Are you going to have an outing?

    —  __________ .

     A. I can’t say.                      B. Yes, I will do.

     C. It’s fun to do so.                   D. That all depends.

23. When_________ different cultures, we often pay attention only to the differences without noticing the many similarities.

     A. compared                            B. being compared    

     C. comparing                                D. having compared

24. _________, I think, and the problems would be settled.

A. If you double your efforts         B. Making more efforts

C. So long as you don’t lose heart       D. A bit more effort