阅读下面短文,从短文后各题所给的A、B、C三个选项中,选出可以填入空白处的最佳选项。
A gentleman needed a young man to help him in his office, so he put an advertisement in a newspaper. Nearly fifty people applied for the job. He in a short time 1 one and sent the rest away.
"I should like to know," said a friend, "why did you 2 that young man, who didn't bring a recommendation(推荐信) with him?"
"You are mistaken," said the gentleman. "He had a great many."
"He wiped his feet at the door and 3 the door after him, showing that he was tidy and orderly."
"He gave up his seat immediately to that old man, indicating that he was 4 and thoughtful."
"He took off his cap when he came in and answered my questions without delay(延迟), showing that he was polite and a 5 thinker.
"He lifted up the book which I had purposely laid on the floor, and 6 it on the table, while all the rest stepped over it, or kicked it aside, showing that he was careful.
"And he waited 7 for his turn instead of pushing the others aside, indicating that he was modest(谦逊的).
"When I talked with him, I noticed that his 8 was carefully washed, his hair in nice order, and his teeth as white as milk. When he wrote his 9 , I observed that his fingernails were clean.
"Don't you call these 10 letters of recommendation? I do; and what I can tell about by using my eyes for ten minutes is worth more than all the fine letters he can bring to me."