1~5 C D A B D

Task 2

1~5 A C A C D

Task 3

1、emerging

2、residents

3、participants

4、companionship

5、soldiers

6、isolated

7、extraordinary

8、who happen to live by themselves die at twice the rate of those live with others

9、It's clear that reaching out to others can help our bodies thrive

10、only 5 percent of U.S. households consisted of one person living alone