26. What a pity. Considering his ability and experience, he ____ better. 　　　(A) need have done (B) must have done 　　　(C) can have done (D) might have done

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 　　　