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I. Complete the sentences with “used to+V” or “didn’t use to+V”: 1. Tom used to a famous singer but he doesn’t sing now. 2. They eat rice now but they _______ potatoes when they were in the village. 3. Now most of us have a motorbike to get to work. We _______ a bike to school when we were pupils. 4. Now there are several restaurants in this town but there _______ only one a few years ago. 5. When my brother was a little boy she _______ in rains but he doesn’t now. 6. The little girl doesn’t cry now but she _______ a lot after she was born. 7. He likes jogging now but he _______ doing it. 8. My neighbors play with me now but they _______ with me and my sisters. 9. My uncle _______ but now he has given up smoking. 10. She lives with her parents now but she _______ alone. II. Rewrite the following sentences, using “USED TO” 1. They often went to Da Lat in the summer._…………………………………………………… 2. We usually played soccer in the past._………………………………………………………... 3. I got up early when I had work._……………………………………………………………… 4.Tom did his homework in the evening._………………………………………………………. 5. Lan wrote to Maryam 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._…………………………………………………………… III. Fill in each blank with a suitable question word: 1. …............................. is it from your house to school? About 100 meters. 2. …............................. is your address? 50 Nguyen Hue Street, Hue. 3. …............................. have you studied French? For 4 years. 4. …. ...........................do you go to school everyday? By bus. 5. …. ...........................do you often get up? At 6a.m. 6. …. ...........................helped you do housework? My cousin. 7. …............................ is your grandma? 65 years old. 8. …............................ is this swimming pool? About 3 meters 9. …. .......................... are there in your class? There are 45 students. 10. …......................... are your shoes? 100,000 VND. IV. Make questions for underlined words. 1. I’m taking French this semester.→……………………………………………………….. 2. She’s staying there for two weeks. →…………………………………………………….. 3. She is worried about the next exammination. →………………………………………….. 4. I like English very much. →………………………………………………………………. 5. I began to study English six years ago. →………………………………………………… 6. They live in the city center. →……………………………………………………………. 7. Last night I went to a disco with my friend. →…………………………………………… 8. I like “Tom and Jerry” because it’s very interesting. →………………………………….. 9. Nelson Mandela was awarded the Nobel Prize for peace in 1993. →……………………………………………………….. 10. He writes home twice a month. →………………………………………………………..

Tốc độ sóng hấp dẫn bị tính sai rồi ạ ??. Mời bạn vào trang bách khoa toàn thư wikipedia để xem thông số của sóng hấp dẫn qua từ khoá tìm kiếm là : “Quan sát trực tiếp sóng hấp dẫn lần đầu tiên “ vào trang tìm kiếm google nhé. Trong trang thống kê thông số của sóng hấp dẫn này thì khoảng cách quãng đường nguồn phát sóng hấp dẫn là 1,3 tỷ năm ánh sáng = 1.22*10^22 (Km). Thời gian nguồn phát sóng hấp dẫn này là 0,2 (s). Do đó, tốc độ sóng hấp dẫn này là: quãng đường/thời gian = 1,22*10^22/0,2 = 6.14*10^22 (km/s). Tốc độ này cao hơn nhiều hằng số c=300000 của tốc độ ánh sáng chứ ạ . Thế nhưng các nhà khoa học bảo là sóng hấp dẫn này có tốc độ bằng c cơ ạ !!!. Tôi nói thế có đúng không ạ ??. Xin cảm ơn!!!.

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