Tìm lỗi sai và sửa lại 6. The black toy car is my, and the white one is hers. 7. She understands the reason for the foundation of the club, didn't she? 8. In 2050, the world's population will grown to 9 billion. 9. Your father used to drink coffee every morning, usedn't he? 10. Less than thirty children each year develop the disease.

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