Sentence 1: I gave the waiter my cash. 
 Sentence 3: I had never paid at a restaurant before 
 Sentence 4:  He was having a party 
 Sentence 5:  I was with my brother close to his wedding 
 Option 1: It was time to pay. 
 Option 2: I had already paid for my food earlier, but I had ordered another drink since then.