Bai 1: 1 nguoi di xe may tu A den B voi van toc trung binh 30km/h. Khi den B nguoi do nghi 20 phut roi di tu B ve A voi van toc 25km/h. Tinh quang duong AB, biet thoi gian ca di va ve la 5h 50 phut. Bai 2: 1 xe khach khoi hanh tu A den B voi van toc 50km/h. Sau do 30 phut, 1 xe con xuat phat tu B ve A voi van toc 60km/h. Biet quang duong AB dai 80km. Hoi sau bao lau ke tu khi xe khach khoi hanh, 2 xe gap nhau? Bai 3: 1 o to di tu Ha Noi den Den Hung voi van toc trung binh 30km/h. Tren duong tu Den Hung ve Ha Noi, van toc o to tang them 10km/h nen thoi gian ve ngan hon thoi gian di 36 phut. Tinh quang duong tu Ha Noi den Den Hung

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Exercise 3: Rewrite the sentences, beginning with the words in parentheses: 1. She has plenty of money, but she is very mean. (although) ______________________________________________________________ 2. They have a car, but they rarely use it. (though) ______________________________________________________________ 3. He was innocent, but he was sent to prison. (although) ______________________________________________________________ 4. He has a number of relatives living nearby, but he never visits them (even though) ______________________________________________________________ 5. She never takes any kind of exercise, but she is quite fit and healthy. (even though) ______________________________________________________________ 6. The keyboard wasn’t working well. She tried to finish the letter (although) ______________________________________________________________ 7. The forecast said it would rain. It turned out to be a beautiful day. (although) ______________________________________________________________ 8. I’m no better. I’ve taken the bill. (even though) ______________________________________________________________ 9. The traffic was bad. I arrived at the airport on time. (though) ______________________________________________________________ 10. I didn’t get the job. I had all necessary qualifications. (though) ______________________________________________________________ 11. We enjoyed the vacation. It rained a lot. (although) ______________________________________________________________ 12. She felt sick. She went to work. (though) ______________________________________________________________ 13. I was really tired. I couldn’t sleep. (even though) ______________________________________________________________ 14. He is very rich. He isn’t happy. (although) ______________________________________________________________ 15. She couldn’t answer the question. She is very intelligent. (though) ______________________________________________________________