题目内容：

阅读下面材料，在空白处填入适当的内容或括号内单词的正确形式。

Yuan Longping was born in 1930.Since he graduated from Southwest Agricultural College in 1953,he1.(devote)his life to finding ways2.(grow)more and more rice.As a young man, he saw the great need for increasing the rice output. At that time3.(hungry)was a serious problem in many parts of the countryside. Yuan searched 4. a way to increase rice harvests without 5.(expand) the areas of the fields.In 1950,Chinese farmers could produce about 56 million tons of rice.In6.recent harvest,however,nearly 200 million tons of rice were produced.These increased harvests mean that 22% of the world’s people7.(feed)from just 7% of the farmland in the world.Yuan LongPing is now circulating his knowledge in India and many other less8.(develop)countries to increase their rice harvests.9.(thank)to his research,the UN is trying to rid the world10.hunger.Using his hybrid rice,farmers are producing harvests twice as large as before.