Решение:
- people who are getting medical help — patients
- to stop or slow down a car or bike — brake
- hurts a lot — killing me
- sticks that you put under your arms to help you walk — crutches
- a hard hat you use to protect your head — helmet
- when a doctor cuts into a body to repair a problem — operation
Ответ: 1. patients; 2. brake; 3. killing me; 4. crutches; 5. helmet; 6. operation.