Sentence 1: I was at work when I got the phone call about the World Trade Center. 
 Sentence 3: We watched the news seeing the first building on fire 
 Sentence 4:  I then saw a airplane fly into the second building 
 Sentence 5:  Many of us watching it were either screaming or crying 
 Option 1: I ran upstairs where the television was to watch the news with others. 
 Option 2: I took the elevator upstairs where the television was to watch the news with others.