On September 11, 2001, terrorists hijacked four planes, using them to attack the World Trade Center
buildings in New York City and other American targets.
1. How many people died in the terrorist attacks?

Should composting be required in school cafeterias? some people believe that uneaten food from school cafeterias should be composted to reduce the amount of trash in landfills. others argue that composting is time-consuming and difficult for schools to manage.