题目内容：
根据下列材料，请回答题After the birth of my second child, I got a job at a restaurant. Having worked with an experienced 16 for a few days. I was 17 to wait tables on my own. All went 18 that first week. When Saturday night came, I was luckily 19 the tables not far from the kitchen, 20 , I still felt it a little hard to carry the heavy trays(托盘).
Before I knew it, the 21 was full of people. I moved slowly, 22 every step. I remember how 23 I was when I saw the tray stand near the tables; it looked different from the one I was 24 on. It had nice handles, which made it 25 to move around. I was pleased with everything and began to 26 I was a natural at this job.
Then, an old man came to me and said, "Excuse me, dear, my wife and I loved 27 , you work. It seems your tray stand has been very 28 to you, but we are getting ready to 29 now, and my wife needs her 30 back. "
At first his 31 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 32 I wanted to get into a hole and 33 .
Since then, I have leaned from many mistakes such as the one I just 34 . I have learned to be more 35 and not to be too sure of myself.
A．manager
B．assistant
C．cook
D．waitress
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