第二节 完形填空（共20小题，每题1.5分，共30分）
阅读下面短文，撑握其大意，然后从36—55各题所给的四个选项（A、B、C和D）中，选出最佳选项，并在答题卡上将该项涂黑。

After the birth of my second child, I got a job at a restaurant. Having worked with an experienced _ 36 _ for a few days, I was _ 37 _ to wait tables on my own. All went 38 that first week. When Saturday night came, I was luckily _ 39 _ the tables not far from the kitchen. _ 40 _ , I still felt a little hard to carry the heavy trays (托盘).
Before I knew it, the _ 41 _ was full of people. I moved slowly, _ 42 _ every step. I remember how _ 43 _ I was when I saw the tray stand near the tables, it looked different from the one I was _ 44 _ on. It had nice handles (手柄), which made it _ 45 _ to move around. I was pleased with everything and began to _ 46 _ I was a natural at this job.
Then, an old man came to me and said, “Excuse me, dear, my wife and I loved _ 47 _ you work. It seems your tray stand has been very _ 48 _ to you, but we are getting ready to _ 49 _ now, and my wife needs her _ 50 _ back.”
At first his _ 51 _ did not get across. “What was he talking about!” Then I got it. I had set my trays on his wife’s orthopedic walker (助步器). I stood frozen as ice, but my face was _ 52 _ . I wanted to get into a hole and _ 53 _ .
Since then, I have learned from many mistakes such as the one I just _ 54 _ , I have learned to be more _ 55 _ and not to be too sure of myself.