閱讀下面材料，在空白處填入恰當(dāng)?shù)膬?nèi)容（不多于3個詞）或括號內(nèi)單詞的正確形式。

Born in 1930, Yuan Longping graduated 1. Southeast Agricultural College in 1953. Since then, finding ways to grow more rice 2. (be) his life goal. As a young man, he saw the great 3. for increasing the rice output. At that time, hunger was a 4. (disturb) problem in many parts of the countryside. Yuan Longping grows 5. is called super hybrid rice, making 6. possible to increase rice harvest without 7. (expand) the area of the field. Yuan Longping has been considered the first agricultural pioneer in the world 8. (grow) rice that has a high output. 9. to his research, the UN has more tools in the battle to rid the world 10. hunger.

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