Giúp mình với!!!!!!!!!!!!!!! Tìm và sửa lỗi sai: 1. A lot of people are still unaware about environmental pollution around us. 2. Lang said that he knows how the procedures for doing the experiment, but when he began to work in the laboratory, he found that he was mistaken. 3. When I came to the store to purchase the printer advertise on television, we found that all the printers had been sold. 4. My company is not only raising his prices but also decreasing the production of his product as well 5. The harder her sister tried, the worst he danced before the large audience. 6. Ba said if he had to do another homework, he’d not be able to attend the performance. 7. The Greens have two sons, neither of them lives with them. 8. I went to the United Sates six months ago because mine cousin is out there. 9. It’s high time people pay much attention to education. 10. John, I think you should stop playing computer games and concentrate in your study.