III. Nói các câu sau sử dụng mệnh đề quan hệ. (Lưu ý cách dùng dấu phẩy) Mrs. Quyen does volunteer work at the hospital. She is retired teacher. 1. The man called the police. His wallet was stolen. Last summer I spent my vacation in Sa Pa. My friend is working in it. The museum has just been built recently. We visited it last month. The professor is strict. We know his wife. The reason was unacceptable. She came late for that reason. The day was terrible. I lost my job on the day. The hotel is luxurious. They stayed at the hotel last year. She looked up at the stars. They were twinkling in the sky now. 10. The year was unforgettable. They started their business in the year. 2. 3. 4. 5. 6. 7. 8. 9.