阅读下面短文,在空格处填入一个适当的词或者使用括号中词语的正确形式填空。
Jane: Hi, Jack. What are you doing there?
Jack: I'm reading a book about the American scientist,
George Washington Carver, who made great {#blank#}1{#/blank#} (contribute) to American farming.
Jane: I have read an article about him too. He was
born into a state of slavery.
Jack: Exactly right. But he became {#blank#}2{#/blank#} (know)
for the development of new crops for southern farmers {#blank#}3{#/blank#} main cash crop (经济作物) was cotton.
Jane: And I remember that he carried out many
{#blank#}4{#/blank#} (science) researches on the planting of crops, {#blank#}5{#/blank#} (aim) to improve
the farmers' quality of life.
Jack: You are right. However, he had an unfortunate
family. His parents had eleven children but all of his ten brothers and sisters
died young. {#blank#}6{#/blank#} addition, Carver and his mother was kidnapped (绑架)
and sold to Kentucky when he was just one week old. Though he {#blank#}7{#/blank#} (find) by
his master later, he never saw his mother again.
Jane: I can see {#blank#}8{#/blank#} he had a really hard childhood.
Jack: Yes. But his life changed after slavery was
abolished (废除). He was able to attend a school {#blank#}9{#/blank#} (build) for blacks. Then he
managed to get into the Tuskegee Institute, and began his crop research
{#blank#}10{#/blank#} (short) after graduation.