25. Customs Service officials knew drug dealers_______ across the border, so the government asked the Indians there to help in the fight against the drug dealers.

   A. were coming                                          B. came         

C. had come                         D. had been coming

26. Books are the important records we keep _____ man¡¯s thought, ideas and feelings.

   A. on                      B. up                    C. of                     D. for