Tại sao lại dùng các giới từ đó trong mỗi câu sau: 1. A selfish person is incapable ....of..... true friendship. 2. He was accused ...of... being disloyal to the government. 3. How much time do you spend... on.. homework? 4. Good friendship should be based ..on..mutual understanding. 5. Do you keep in touch…with...any school friends? 6. Some adults have a total lack…of..sympathy…for…..young people. 7. He's more concerned…with……..what people think about him than anything else. 8. She had been briefly acquainted…of…..him more than 20 years earlier. 9. She thought……of…..him very often. 10. Some people take…up……..interest with enthusiasm, but they are soon tired ……of…..it.