Sentence 1: Sandy was hosting lunch for her family's Thanksgiving dinner. 
 Sentence 3: There was no way that she could cook the turkey in time 
 Sentence 4:  Sandy quickly defrosted a couple of chickens 
 Sentence 5:  Sandy cooked the chickens for dinner instead 
 Option 1: He had defrosted the turkey. 
 Option 2: She had forgotten to defrost the turkey.