20．阅读短文，从方框中选择适当的词并用其正确形式填空，使短文通顺、意思完整．请将答案写在下面题号后的横线上．每空限填一词，每词限用一次．方框中有两个词是多余的．
I so know nervous Jimmy but
happy with answer understand look much |
Nine-year-old Jimmy was given a task in school to write a story on"My family's ancestors（祖先）"．The purpose was for the kids to （66）understandtheir family history．
In search of some （67）answersfor his task．Jimmy interviewed his grandmother who of course （68）knewnothing about the reason why Jimmy asked such questions．
When she was asked，"Granny，where did I come from？"his grandma was quite （69）nervous．Why didn't he ask his parents？She had to be quite careful when talking（70）with a kid about such a subject．She wanted to buy some time，（71）soshe replied，"Well，sweetie，the stork（鹳鸟） brought you．"She said no（72）more，hoping that the subject would be dropped until Jimmy's parents came back．
"So，where did Mom come from？"
"The stork brought her also．"
"Well，then where did you come from？"
"The stork brought （73）metoo，sweetie"
"All right，thanks，Granny"
（74）Jimmy'sgrandmother did not think anything more about his questions．Three days later，when she was tidying up and（75）looking at Jimmy's desk，she read the first sentence of his paper，"For three generations（辈）there have been no natural births in our family"．
there，underThere is a cat under the desk．．