một hình chữ nhật có có chu vi 70cm được chia thành hai phần bởi một đoạn thẳng song song với chiều rộng sao cho phần thứ nhất là một hình vuông,phần thứ hai là một hình chữ nhật có chiều dài gấp 3 lần chiều rộng.Tìm diện tích hình chữ nhật ban đầu

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Exercise 3: Changed into negative and interrogative form. 1. They used to play tennis twice a week. They didn’t use to play tennis twice a week. Did They use to play tennis twice a week? 2. I used to go to the gym three times a week. .......................................................................................................................................... .......................................................................................................................................... 3. Tennis used to be a sport for rich people only. .......................................................................................................................................... .......................................................................................................................................... 4. My father used to take me to see soccer games on Saturday. .......................................................................................................................................... .......................................................................................................................................... 5. He used to buy a new tennis racket. .......................................................................................................................................... .......................................................................................................................................... Exercise 4: Rewrite the sentences with "used to". 1. They often went to Da Lat in the summer. They used to go to Da Lat in the summer. .......................................................................................................................................... 2. We usually played soccer in the past. .......................................................................................................................................... 3. I got up earlier when I had work. .......................................................................................................................................... 4. Tom did his homework in the evening. .......................................................................................................................................... 5. Lan wrote to Mary twice a month. .......................................................................................................................................... 6. He worked at night when he worked in the supermarket. .......................................................................................................................................... 7. Did they watch TV in the past? .......................................................................................................................................... 8. She played badminton in her free time. .......................................................................................................................................... 9. They went swimming in the afternoon in 1990. .......................................................................................................................................... 10. He was a doctor in that hospital. ..........................................................................................................................................