根据句意及首字母提示在横线处填上恰当的单词，使句子意思完整，语法正确。
1. My d_____ life has changed a lot since I went to middle school.
2. I know your leg hurts. Just be p_____ and the doctor will arrive soon.
3. It was carelessness that c_____ the traffic accident.
4. Even t_____ the parents work very hard, they can't afford their son's university education.
5. When we learn new words, we should pay more a_____ to how to use them well.
6. Think it over before you make a big d_____.
7. We shouldn't w_____ paper, because trees are becoming fewer and fewer.
8. His pet dog's d_____ made him not feel like eating.
