25. I _____ it as a basic principle of the company that suppliers of raw materials should be given a fair price for their products. 　　　 (A) make (B) look 　　　(C) take (D) think

31. It was announced that only when the fire was under control ___ to return to their homes. 　　　(A) the residents would be permitted 　　　(B) had the residents been permitted 　　　(C) would be residents be permitted 　　　(D) the residents had been permitted 　　　