Sentence 1: Erin was sitting at home doing homework. 
 Sentence 3: He jumped and tried to get away 
 Sentence 4:  Erin reached for the bug spray in his cupboard 
 Sentence 5:  By the time he came back, the bug had escaped 
 Option 1: While he was busy writing, he noticed a roach climb on his paper. 
 Option 2: He was so tired that he went to his room and fell asleep.