Решение:
- If you want to become a professional pianist, you need to practice every day. (PROFESSION)
- He made himself useful by handing round the coffee cups. (USE)
- There was an amusing story in the paper this morning. (AMUSE)
- She may be friendly but she isn't reliable. (RELY)
- Eating too much chocolate is unhealthy. (HEALTH)
Ответ: professional; useful; amusing; reliable; unhealthy.