Giải thích hộ mình tại sao lại sửa như thế với ạ 81. Before I came to England, I hadn't had the opportunity to speak to people their native tongue is English. A B C D 82. No one has said anything would persuade me to change my mind. A B C D 83. The woman sitting on the red chair is the person to who you must give this envelope. A B C D 84. There are some teachers in our school try to improve the quality of teaching by making use of hi-tech A B C D devices. 85. Modern children, who lives have become more and more dependent on electronic devices, find the A B C traditional way of teaching very dull and boring. D 86. Smartphones and tablets which can be used as effective learning tools for children. A B C D 81. D. their => whose 82. c. would 83. C. to who => to whom 84. B. try => trying 85. A. who => whose 86. B. which => bỏ which