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.