6. Peter **(A)** usually **(B)** has his car **(C)** washed at weekends.
- Sửa: **(C)** washed (đúng) - Không cần sửa.

7. Do you know the boy **(B)** whose bicycle **(C)** was stolen last night?
- Sửa: **(C)** was stolen (đúng) - Không cần sửa.

8. Until I **(B)** got enough money, the picture **(C)** that I wanted **(D)** had sold.
- Sửa: **(D)** had sold → **(D)** was sold.

9. Hand me the letters **(C)** typed by the secretary **(D)** yesterday.
- Sửa: **(C)** typed (đúng) - Không cần sửa.

10. Tom **(A)** is considered to be the **(C)** best student **(D)** in his class.
- Sửa: **(D)** in → **(D)** of.

11. It’s **(A)** believed that **(B)** our lives ...
- Sửa: **(B)** (đúng) - Không cần sửa.