Sentence 1: David and I went to work at our grocery store. 
 Sentence 3: The store's electricity went out which had caused the vegetables to go bad 
 Sentence 4:  We had to go to each vegetable section and throw all the veggies away 
 Sentence 5:  This was the biggest waste I've seen 
 Given Sentence 2: Everything was fine until an unforeseen accident occurred.