Sure, here are the corrections for each sentence:

1. Trang fancies **speaking** English with her classmates.
- Correction: "to speak" should be "speaking".

2. She lives in **England** and works as a reporter.
- Correction: "the England" should be "England".

3. If Lan **doesn't** save electricity, she will **lose** much money for electricity bills.
- Correction: "won't" should be "doesn't" and "loose" should be "lose".

4. **What** do they use in the festival? - A flute.
- Correction: "Who" should be "What".

5. Mr. John usually drives more **carelessly** than his wife.
- Correction: "careless" should be "carelessly".

6. In his free time, my grandpa enjoys **catching** fish and feeding pigs.
- Correction: "to catch" should be "catching".

7. I lost my wallet on the last day of my stay in **Paris**.
- Correction: "the Paris" should be "Paris".

8. I'll give you a call if I **need** some help tomorrow.
- Correction: "needs" should be "need".

9. **When** does Hoa Ban Festival take place? - In March.
- Correction: "What" should be "When".

10. If you don't study more **carefully**, you won't get good marks.
- Correction: "careful" should be "carefully".