Sure! Here are the completed sentences:

1. My sister sings better than me. ➜ I don't sing **as well as she does.**

2. Ballets and modern dance are quite different. → Ballets and modern dance are not **the same.**

3. Rock is very exciting. It is not like country music. → Rock is very **different from country music.**

4. City life is busy, but country life is peaceful. → City life is not peaceful **like country life.**

5. I like pop music, but my brother likes rock music (different). → My taste in music **is different from** my brother's.

6. A vacation on the beach is relaxing, while a vacation in a big city may not be. ➜ A vacation on the beach is **more relaxing than** a vacation in a big city.

7. This film is interesting. The film we saw last week was interesting (as....as). → This film **is as interesting as** the film we saw last week.

8. Composer Hoang Long wrote many good songs for children. Composer Pham Tuyen also wrote many good songs for children. - Composer Hoang Long **wrote as many good songs for children as** Pham Tuyen.

9. I think action films are more exciting than romance films. In my opinion, romance films are not **as exciting as** action films.

10. The Vatican Museum has excellent works of art. The Louvre Museum has excellent works of art. ➜ The Vatican Museum's works of art are **the same as** the Louvre Museum's works of art.

Feel free to ask for further assistance!