单词拼写

根据首字母或所给中文提示, 写出正确的单词完成句子。

1. Are our children being              (中毒）by lead in the atmosphere?

2. John Snow faced bravely the  c________________ to defeat cholera.

3. Thousands of foreigners were______ （吸引）to  the Shanghai World Expo the day it opened.

4. We should have an _____________ （乐观的）attitude towards life.

5. He got an e_______________ shock when pushing the button.