9. Only if you put the sun there __________ the movements of the other planets in the sky ________ __________(说得清楚).

8. ________ _________ this ___________ _________ (为防止这种情况再次发生)again, John Snow suggested that the source of water supplies ___________ _____________ (检测)and that new methods of _______ _____ (处理)polluted water _______ _______(找到).

7. Snow was able to announce ___________ _________ (肯定)that __________ water __________(污水携带病菌)the disease.

6. He became __________ (兴奋)hen he thought about helping ordinary people ___________ ________ (感染)cholera.

5. ______ _______ the water ______ _______ _______。( 看来，霍乱的流行要归罪于饮用水了).

4. He ______ on a map ________ the dead people had lived.

(他在一张地图上标明了死者住的地方)

3. He ________ ______ _______ __________ why. (他决定查明原因)

2. He _______ _______ ______(感兴趣)two theories ______(解释)how cholera killed people.

1. Many thousands of _________ people died ________ ________ there was _________ _________ _________ cholera. (每当爆发霍乱时，就有大批惊恐老百姓病死)

10. 从事一项新的事业________________________________

Part 3 Complete the following sentences according to the texts.