Here are the answers based on the text provided:

**Exercise 8: Fill in the blanks with the correct options:**

1. English (1) **is** spoken by many people around the world.
2. It is often considered (2) **an** international language.
3. English has become a global language due to its use in business, science, and entertainment.
4. It’s important to practice regularly to avoid (4) **failure** in your progress.

**Exercise 9: Write meaningful sentences using the words given.**

1. Bun Cha is a **traditional** Vietnamese dish.
2. Each my sisters are **very different from** others.
3. I’d prefer to **not have sugar left** in the refrigerator.
4. She’d **not draw pictures as well as** her brother.
5. We joined **community activities last summer**.

**Exercise 10: Re-write the sentences but keep their meaning unchanged.**

1. Her picture is **different from** mine.
2. Kanh is a better painter **than** Giang.
3. I much prefer country life to city life. → **I don’t like living in the city.**
4. Her picture is **not the same as** her brother’s.
5. This year’s performance is not very good. Last year’s was better. → **This year’s performance is worse than last year’s.**
6. My father likes to do gardening at the weekend. → **My father enjoys gardening at the weekend.**
7. Jimmy's voice is more beautiful than Johnny. (AS) → **Johnny's voice is not as beautiful as Jimmy's.**
8. The plots of the film are not the same as those of the novel. (FROM) → **The plots of the film are different from those of the novel.**
9. Kien's presentation was clearer than Mai's presentation. (NOT) → **Mai's presentation was not as clear as Kien's.**
10. Mark's music project is different from mine. (LIKE) → **Mark's music project is not like mine.**