Here are the identified mistakes in each sentence along with their corrections:

1. **Mistake:** C. on
**Correction:** in (correct phrase: "keep fire extinguishers in a safe place")

2. **Mistake:** A. stock
**Correction:** stock up (correct phrase: "Stock up on emergency items such as first aid kits and supplies")

3. **Mistake:** D. caused
**Correction:** cause (correct phrase: "How much damage did the avalanche cause?")

4. **Mistake:** B. was
**Correction:** were (correct phrase: "What were you doing when the earthquake hit the city?")

5. **Mistake:** D. long
**Correction:** tall (correct phrase: "How tall was the wave?")

6. **Mistake:** C. did
**Correction:** does (correct phrase: "How many does it take to stop the fire?")

7. **Mistake:** A. an
**Correction:** a (correct phrase: "If there's a earthquake, remember to get in the desk...")

8. **Mistake:** C. calling
**Correction:** call (correct phrase: "If you are in danger, call the emergency service...")

9. **Mistake:** B. to watch
**Correction:** watching (correct phrase: "Lan Anh enjoys watching cartoons on TV.")

10. **Mistake:** B. to complete
**Correction:** completing (correct phrase: "She always tries completing her homework before watching her favourite show on TV.")