1 . Through Snow’s _____________, water companies began to sell clean water and the threat of cholera around the world saw a substantial decrease.
经过斯诺的不懈努力，饮用水公司开始出售洁净水，世界各地霍乱的威胁大幅降低。

2 . They had been given free beer, and so had not drunk the water from the pump. Snow suspected that the water pump _____________. 
这些幸存者在剑桥街7号的酒吧工作，酒吧为他们提供免费啤酒，因此没有喝水泵抽上来的水。斯诺怀疑水泵就是罪魁祸首。

3 . Yuan _____________ the answer could be found in the creation of hybrid rice. 
袁隆平坚信，可以在杂交水稻的培育中找到答案。

4 . They have the confidence and ability ________ (handle) the important matter well. (所给词的适当形式填空)

5 . Some students don’t know ______ (如何平衡学习与玩耍). (根据汉语提示完成句子)

6 . 【课本改编题】
Economic development is necessary if we want to improve society.... and it is not possible to preserve everything from our past as we move towards the future. Finding and keeping the right ______ and the protection of cultural sites can be a big challenge. （根据课文内容填空）

7 . The teacher called on students to answer questions at r_________________, so everyone had to be prepared. (根据首字母单词拼写)

8 . We should adopt the concept of s_________________ development to ensure the natural systems and the environment are preserved for the future generations. (根据首字母单词拼写)

10 . People ________ (panic) and fled in all directions when they heard a deafening explosion in the street corner. (所给词的适当形式填空)