She is making herself ill with _____ over her son's future.

　　A. trouble    B. annoyance    C. disgust    D. worry

　　 Lei Feng is always ready to help others when they are in trouble and he never _______ their request.

　　A. turns up B. turns over  C. turns in D. turns down

One summer evening I was sitting by the open window, reading a good but rather frightening mystery story. After a time it was too dark for me to read easily, so I put my book down and turned on the light.
I was just about to draw the   36  as well when I heard a loud cry “Help! Help! ” It 37  to come from the trees at the end of the garden. I looked out but it was too 38  to see anything clearly. So I decided to go out and have a look in the garden, just 39  someone was in   40  . I took the torch and picked up a strong walking stick,   41  that this might come to be useful, too.   42   with these, I went out into the garden.   43   I heard the cry. There was no    44  that it came from the trees at the end of the garden.
“Who’s there?” I   45  as I walked, rather 46  , down the path that   47   to the trees. But there was no  48  . With the help of my torch I   49  the whole of that part of the garden and the lower  50   of the trees. There was no sign of anybody or anything. I came to the ___51___ that someone was playing a rather silly joke on me.
___52   feeling rather puzzled, I went back to the house and   53   away the torch and the stick. I had just sat down when I was startled by the cry of “ Help! Help! ”, this time from  54  my shoulder. I dropped my book and climbed up. There, sitting    55  of the mantelpiece ( 壁炉 ), was a parrot!

I was in a strange city I didn’t know at all, and what’s more, I could not speak a word of the language. On my second day I got on the first bus that passed, rode on it for several stops, then got off and walked on. The first two hours passed pleasantly enough, then I decided to turn back to my hotel for lunch. After walking about for some time, I decided I had better ask the way. The trouble was that the only word I knew of the language was the name of the street in which I lived, and even that I pronounced badly. I stopped to ask a newspaper-seller. He handed me a paper. I shook my head and repeated the name of the street and he put the paper into my hands. I had to give him some money and went on my way. The next person.I asked was a policeman. He listened to me carefully, nodded and gently took me by the arm. There was a strange look in his eyes as he pointed left and right and left again. I nodded politely and began walking in the direction he pointed.?
　　About an hour passed and I noticed that the houses were getting fewer and fewer and green fields were appearing on either side of me. I had come all the way into the countryside. The only thing left for me to do was find the nearest railway station.
【小题1】The writer preferred to walk back to his hotel because.