1.  (Written)  in  the  1910s,  the  nature  writer  Ernest N Seton estimated  (that)   by          A                                                                                                           B                             the  end  of   the  18th century  the  (original) population  of  buffalo  in  North                                                                   C      America  (had  been)  75  (million)                            D                     E 2. In order to (raise)  public  consciousness  (concerning)  environ-mental  problems,                         A                                                     B    every  should  distribute  leaflets, write to  (his  or  her) congressman.                                                                            C    (As well as)  (singing)  the  necessary  petitions.            D                E 3 .Pro-life and pro-choice forces  (are  bracing  for)  (competing)  observance  on                                                                A                          B   Jan 22,   the twelfth  anniversary  of  the  supreme  court  decision  that     (was  struck down)  (most  legal)  (restrictions on) abortion            C                              D                     E 위 3문제 답을 잘 모르겠네요 고수님들 부탁드립니다^^