Here are the corrections for the sentences:

**Part IV: Find and correct the mistakes in the following sentences**

1. Vy is really excited **with** her first day at school.
- Correction: Vy is really excited **about** her first day at school.

2. I found it very **excited** to take part in the spring festival of Bai Dinh Pagoda.
- Correction: I found it very **exciting** to take part in the spring festival of Bai Dinh Pagoda.

3. I'm going to Hoan Kiem Lake **watching** fireworks tonight.
- Correction: I'm going to Hoan Kiem Lake **to watch** fireworks tonight.

4. We **were** to Buon Me Thuot city twice, but we have never visited Don Village.
- Correction: We **have been** to Buon Me Thuot city twice, but we have never visited Don Village.

5. There are many good **restaurant** and amusement parks in our neighbourhood.
- Correction: There are many good **restaurants** and amusement parks in our neighbourhood.

6. I like watching TV. There **are** a good film on TV tonight.
- Correction: I like watching TV. There **is** a good film on TV tonight.

7. If you climb the mountain, you will **sees** a lot of flowers.
- Correction: If you climb the mountain, you will **see** a lot of flowers.

8. My brother and I are really fond **in** watching horror films.
- Correction: My brother and I are really fond **of** watching horror films.

9. My sister prefers reading books **to listen** to music in her free time.
- Correction: My sister prefers reading books **to listening** to music in her free time.