The key answer of exercise 1

What's the job?

1. I protect important people.
2. I catch crabs.
3. I help build roads.
4. I help customers in a bank.
5. I study ocean life.
6. I help students decide on a career.
7. I dig coal out of the ground.
8. I clean chimneys.
9. I light and maintain lamps.
10. I work underwater.