4 . 你改变不了过去，但如果你忧虑未来，将会毁了现在。
You can't change the past, but you can _______________.

7 . 写出下面黑体词的词性及含义
1. John went back to observing nature and asking questions. Why can certain plants trap harmful bacteria (细菌)? _______________
2. When we visited the old family home，past sweet memories came flooding back. _______________
3. She was rushed to the hospital after suffering from shock. _______________

8 . 语法填空

The Alaska earthquake of March 27, 1964 was one of the biggest     1     (disaster) in the earth science. As it was a holiday, many people were at home. Everything was going on as usual     2     people’s houses     3     (shake). Buildings     4     (crack) and water pipes burst. It lasted more than four minutes and many people were buried under the     5     (ruin), who waited for rescue workers to come     6     their rescue. The earthquake left people    7    shock and destroyed many towns and a great number of people suffered     8     the disaster. However, they all did everything in their power     9     (rebuild) the city.