What can you do with nuts?A scientist named George Washington Carver answered that question, over and over again.We should say thanks to him for more than 300{#blank#}1{#/blank#}. When Carver was born in 1864,he was a slave(奴隶）on a farm in Missouri.

    Later, he got freedom. As a teenager,he worked on a farm and{#blank#}2{#/blank#}finish high school. At the age of 30, he became the first back student at the college in lowa.In 1896, he became the first black teacher working at another college in lowa.Several years later, he took a job at a college in Alabama, where he worked until his{#blank#}3{#/blank#}in 1943.

    Carver studied agriculture, the science of farming.His{#blank#}4{#/blank#}made huge improvements in farming in the southern United States.