I.单词填空，根据中文或所给单词的首字母填写单词(15分)：
1. I need to do that because I don’t get enough exercise __________. (否则)
2. It is the most important to keep calm when handling the u________ matter.
3. After graduating from university, she has been working as an __________(会计)
4. They are making a __________ on whether students should wear school uniforms.(调查)
