In this task, you're given five sentences, numbered 1 through 5. Your job is to generate a title for the story that makes complete sense. The title must be short, with less than three words, use simple language, and include the main topic of the story.

Sentence 1: Cara is going to be a big sister! Sentence 2: Cara is going to have a little brother. Sentence 3: Cara is very excited for her little brother. Sentence 4: She will be a big helper. Sentence 5: Cara is a good big sister.
Cara's Sister

Sentence 1: Ben was training to become a police officer. Sentence 2: He had to take tests about crime scene investigations. Sentence 3: On one test, Ben noticed a shoe print at the crime scene. Sentence 4: He investigated this clue thoroughly. Sentence 5: After the results, it dawned on him that it was his own footprint.
Contaminated scene

Sentence 1: Trey was very ill. Sentence 2: His doctor couldn't figure out what the problem was. Sentence 3: He ran a lot of tests. Sentence 4: Finally, the doctor solved the mystery. Sentence 5: It had been the hardest case he'd ever had.
The Doctor