Read and answer the questions!

Do you know  that computers can ..(39).. headaches?  According to a recent report,  many computer workers have this problem.  If you work at a computer more than six hours a day, you might get headaches.  To ..(40).. this problem,  take a break once every hour.  Get up and walk around for a few minutes.  Let your eyes and mind rest.  This is a good way to stop headaches ..(41).. taking aspirin.

 

39.  A. lose                                          C. decrease

       B. cause                                        D. prevent

40.  A. catch                                        C. get

       B. have                                         D. avoid

41.  A. after                                         C. without

       B. before                                      D. while