20．閱讀短文，從方框中選擇適當的詞并用其正確形式填空，使短文通順、意思完整．請將答案寫在下面題號后的橫線上．每空限填一詞，每詞限用一次．方框中有兩個詞是多余的．
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（鸛鳥） 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（輩）there have been no natural births in our family"．
there，underThere is a cat under the desk．．