(   ) 1. I will leave for Shanghai ______.

        A. after three days  B. three days ago    C. in three days      D. before three days

(   ) 2. You can use the Internet ______ a job.

        A. finding             B. finds                 C. find                  D. to find

(   ) 3. —Could you tell me how to repair my computer?

        —I’m sorry, but I don’t know ______.

        A. what to do         B. how to do          C. what to do it      D. how do it