阅读下面材料，在空白处填入适当的内容（1个单词）或括号内单词的正确形式。

Famous scientist as he is, Yuan Longping considers himself a farmer. As a young man, Yuan Longping saw the great need for 【小题1】 (increase) the output. At that time, hunger was a 【小题2】 (disturb) problem in China. He wanted to increase rice harvest without expanding the area of the fields. In 1973, a special strain of rice made 【小题3】 possible to produce 20% more of the crop in 【小题4】 same fields. 【小题5】(thank) to his research, the UN has 【小题6】 (much) tools in the battle to rid the world of hunger. He is now 【小题7】 (circulate) his rice knowledge in less developed countries to increase their rice harvests and he wants to export his rice so 【小题8】 it can be grown around the globe. Though he has 【小题9】 (struggle) for the past five decades, Yuan Longping is quite 【小题10】 (satisfy )with his life. In his spare time, he enjoys listening to violin music, playing mah-jong, swimming and reading.