阅读下面短文，从下列各题所给的四个选项中选择最佳选项。

    One evening, David ran to the house and said to his mother, "Mom, what do you 1 Jack? Bob tells me that Jack…"

    "My boy, does your 2 go through (经过) the three sieves (滤网) ?" his mother asked.

    "Sieves? What are 3 asked David.

    "Well, the first sieve is 4 true. Is your story true?" his mother asked.

    "I don't know, 5 Bob says…", David answered.

    "Well, 6 the second sieve — being good? Is your story good? "

    "No," David said.

    "Now the 7 sieve—being necessary (必要的) . Do you have to tell the story to 8 people?" his mother asked.

    "No, Mom. It's just a 9 thing, "said David.

    "Well, my boy," the mother said, " 10 it is not necessary, not good, and not true, let it go."