单项选择题

During the whole of a dark, cloudy day near the end of the year I had been (31) my horse along country roads with little life or beauty. (32) evening fell, I found myself within view of the House of Usher. I do not know why, but my first sight of it (33) my heart heavy. I stopped my horse (34) the edge of the black and quiet lake that lay beside the building. (35) down into the water , I saw a (36) of the dark old house and the dying trees in it. There was something in that reflection that (37) fear to my heart, though I could not tell what (38) .
I looked up at the old house itself, which was made (39) stone. None of the wall had fallen, but many stones (40) to be loose. There (41) to be a break in the front of the building, (42) down the wall (43) the top until it had lost in the dark water of the lake.
I had come to visit a childhood friend , Roderick Usher. I (44) him for many years , and I knew very (45) about him. But he had written me a letter, (46) me to come. He was sick in body and in mind ,and he wanted to see me,his.best and oldest friend. I could not refuse. But now, something about the house frightened me. The room (47) the friend met me was almost dark , but I could see that he had changed very much (48) our last meeting many years ago. He looked ill, and there was a wild look in his eyes. He was nervous--he would be active for a few moments and then Suddenly he Would be very, quiet. He told me that he bad a family illness which could not be cured.
The worst part was his fear of everything. The light hurt his eyes, and even a small noise filled him (49) fear. Most of all he was afraid of (50) . Fear had become part of his life, such as it was now.