Sentence 1: Gertrude wanted to tell more people about her world travels. 
 Sentence 3: She wrote detailed accounts of her travel with fun pictures 
 Sentence 4:  Soon Gertrude's travel blog became very famous 
 Sentence 5:  Gertrude was so happy that she began writing a blog 
 Option 1: She decided to begin writing a travel blog. 
 Option 2: She decided to begin writing a travel book.