Sentence 1: Pam was with her friends at lunch. 
 Sentence 3: Some of the group left to get snacks 
 Sentence 4:  Then, Pam's friend let her know she had food in her teeth 
 Sentence 5:  Pam was so embarrassed and she went to clean her teeth 
 Option 1: They were all chatting and having fun. 
 Option 2: They were all arguing and left separately.