Sentence 1: I saw this new pair of shoes online and decided to contact the seller. 
 Sentence 3: When I met up with him, we exchanged the money and shoes 
 Sentence 4:  After he was gone, I opened up the shoe box 
 Sentence 5:  I noticed that no shoes were in the box, only rocks 
 Given Sentence 2: We decided to meet up in a few days.