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.