From (2) and (3), I know that Wang Jian helps his family clean, while Cao Qiang insists on helping his classmates make up lessons every day.

I learned from (6) that Li Ming found the watch and gave it to the police.

From (7), I know that Wang Jianxiu is repairing tables and chairs.

From (4) and (6), we can see that Cao Qiang is on duty in the neighborhood committee (because in 6, Wang Jian has done two things), so only Li Ming is the person who cleans the neighborhood.

So Li Ming cleaned the community, picked up his watch and gave it to the police.

Cao Qiang took part in the voluntary work of the neighborhood committee and helped the students make up lessons.

Wang Jianxiu helps military families clean up their desks and chairs.