Помогите не могу сделать номер 3! Срочно!

2. Victor has been a worker for ten years 3. Jim has been a doctor since he finished school 4. William and Bob have been clowns for three years and a half 5. Patrick has been a cosmonaut since 2011 6. Diana has been a (не пойму кто она по профессии??)for 7 years 7. Margo has been an artist since 2010 8. Kevin has been a pilot for 5 years and a half