Carver studied peanuts.He knew that the south couldn't grow just cotton. Planting cotton year after year wore out the soil and made it useless.Carver learned that if farmers planted cotton one year and peanuts the next,the soil____healthy.

    To encourage this practice,Carver thought of new uses for the peanut.Would you like to try peanut and raisin ice cream? How about using peanuts as a kind of____ to make shampoo? Perhaps you would prefer to make paint from peanuts,or maybe you would like to bake with peanut flour.Glue? Paper? Rubber? The list goes on and on.He also thought of____uses for pecans (山核桃）and other nuts.

    Carver____little from most of his inventions.He didn't feel that it was right to sell his ideas. He gave them freely to help farmers and fellow scientists.Carver's life is one that we could all use as an example.