Một ô tô dự định đi từ A đến B cách nhau 120 k/m trong một thời gian quy định . Sau khi đi 1 giờ thì ô tô bị chặn bởi xe cứu hỏa 10 phút. Do đó để đến B đúng hạn thì xẽ phải tăng vận tốc thêm 6 k/h.Tính vận tốc lúc đầu của ô tô.

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15.1. Read the situation and write sentences from the words in brackets. 1. You went to Sue's House, but she wasn't there. ( she/ go/ out) ......................................................... 2. You went back to your home town after many years. It wasn't the same as before. ( it/ change/ a lot) .................................................. 3. I invited Rachel to the party, but she couldn't come. ( she/ arrange/ to do something else) ................ 4. You went to the cinema last night. You got to the cinema late. ( the film/ already/ begin) .................................... 5. It was nice to see Dan again after such a long time. ( I/ not/ see/ him for five years) .......................... 6. I offered Sue something to eat, but she wasn't hungry. ( she/ just/ have/ breakfast) ............................... 15.2. For each situation, write a sentence ending with never...before. Use the verb in brackets. 1. The man sitting next to you on the plane was very nervous. It was his first flight. ( fly) ......................................................................... 2. A woman walked into the room. She was a complete stranger to me. ( see) I ........................................................ before. 3. Sam played tennis yesterday. He wasn't very good at it because it was his first game. ( play) He ................................................................ 4. Last year we went to Denmark. It was our first time there. ( be there) We ........................................................