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　　Mr. Clark worked in an office. He had a lot of work to do every day. But later he began to 　1　 things and this made his work very 　2　. One day Mr. Clark said to himself, “I 　3　 go to see Dr. Martin.”

　　He waited at least two hours in the doctor's waiting-room 　4　 there were 　5　 people who also wanted to see the doctor. 　6　 the nurse said to him,“You can come in and see Dr. Martin now.”

　　“What can I do for you?” asked Dr. Martin.

　　“Oh, doctor,” said Mr. Clark. “There is something wrong with my 　7　. I can't remember 　8　. I have no way to keep things in mind for 　9　 than half a minute. And it's making my work very difficult. What can I do? Can you help me?”

　　“When did it start, Mr. Clark?” The doctor asked.

　　“When did 　10　 start?” Mr. Clark asked.

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