Corrected Sentences:
- We can help you! We know first aid.
- Do you need a police officer? Dial 999!
- Exercise makes me feel amazing.
- 'What's the matter?' 'I fell over while I was playing in the park and now my foot is hurt.
- Do you happen to have Dr Blake's telephone number in this book?
- The horse fell down in the icy field and hurt its leg.
Reasoning: Each phrase was corrected by selecting the word that makes the most sense in the given context and adheres to common English usage.