- bike: motorbike or bicycle
- bruise: hurt oneself leaving a purple mark
- catch: discover someone doing something they shouldn't
- corner: place where two streets meet
- emergency: a situation that is serious or dangerous
- fortunately: luckily
- hike: go for a long walk in the country
- knee: leg joint
- prom: a formal school dance
- roll: move by turning over and over
- rush: hurry
- siren: thing police cars and ambulances have
- someone else: another person
- speed: go very fast
- trust: believe someone will do as they say