Dinosaurs died out long before people appeared. Dinosaurs lived from about 230 million years ago to about 65 million years ago. There are several theories about why dinosaurs became extinct. Many scientists believe that there was a sudden, (22) _____ event. They think that an asteroid or comet (23) _____ with the earth. Fire from the impact burned large areas. Dust blocked sunlight from (24) _____ the surface of the earth. Acid rain fell everywhere. Plants could not grow. There was no food for the plant-eating dinosaurs, so they died out. Other scientists think that the environment changed. Maybe the (25) _____ grew colder and dinosaurs slowly became extinct over several million years. Many scientists think that birds descended from a small kind of dinosaur. If this is true, then dinosaurs are still (26) _____ in the form of modern birds. 22. A. violet B. violence C. violent D. violently 23. A. crashed B. collided C. confronted D. met 24. A. reaching B. arriving C. approaching D. coming 25. A. days B. atmosphere C. weather D. climate 26. A. lively B. alive C. living D. live

Trong mặt phẳng oxy cho 3 điem A(2,1) B(-2,5). C(6,3) a) viết phuong trình tham số cua đoạn thẳng BC b viết pt tham số cua trung tuyếnnAM

IV. Read the following passage about the Statue of Liberty in New York. Decide if the statements are true (T) or false (F). Circle T or F. The Statue of Liberty is situated in New York Harbour. It was a gift to the United States from the people of France. The statue's 300 copper pieces were transported to America on a ship. In 1886, the statue was the tallest iron structure ever built. From the ground to the top, it measures 93 metres. Lady Liberty holds a torch in one hand and a tablet in the other. On the tablet is the date of America’s first Independence Day, July 4, 1776. A broken chain lies at her feet. The statue is a symbol of freedom. Approximately four million people visit the statue each year. The statue will be celebrating its 130th birthday in October 2016. 1. The Statue of Liberty was built in the United States. T F 2. The Statue of Liberty is the tallest iron structure now. T F 3. The statue was brought to America in separate pieces. T F 4. The statue is an icon of freedom T F 5. The Statue of Liberty is 130 years old. T F CÂU SAI SỬA LẠI CHO MÌNH NHÉ

Tìm x nguyên để căn x+1 chia hết cho căn x-3

ae cho mình hỏi tại sao đường chéo lại là kx vậy

Sinh tố (vitamin) tan trong nước là: giup mik voi

chỉ cần làm giống như thế thay đổi

Quân đội đồng minh nào đã có mặt tại VN sau thế chiến thứ 2 ?

Lấy một số ví dụ trong thực tế về các cách làm thay đổi nhiệt năng của một vật ?

I. Put the verb in the bracket into the past simple or present perfect tense. 1. My brother is a writer. He (write) _____ 10 books. 2. I (not have) ______________ a holiday in 2012. 3. He (play) _______________ badminton yesterday. 4. __________________ (she/be) to Sa Pa? -Yes, she has. 5. Dalat is the most beautiful city I (visit) __________ . 6. What time (you/go) ____ to the beach yesterday afternoon ? 7. Sa Pa is great. ____ you (be) ___________ there? - Yes, I have. 8. Where _______ (you/go) _______ there? - I (go) ______ there last month. 9. How long _______ Tina (be) ______ in Italy? 10. What (you/watch) ____________ on TV last night? II. Rewrite the sentences with the same meaning. 1. The last time we saw her on Christmas Day. → We haven’t ………………………………………………………………………. 2. I have never eaten this kind of food before. → This is …..………………………………………………………………………. 3. It started to rain an hour ago. → It has ……………………………………………………………………………. 4. They haven’t visited their grandparents for two months. → The last time …………………………………………………………………… 5. We have studied English since we were in grade 3. → We began ………………………………………………………………………. 6. My sister hasn’t seen her best friend for nearly two years. → It’s ……..………………………………………………………………………. 7. When did you start learning English ? → How long ……………………………………………………………………….? 8. We started living here fifteen years ago. → We have ..………………………………………………………………………. 9. The last time she visited me was five years ago. → She hasn’t ………………………………………………………………………. 10. I last wrote to my cousin in February. → I haven’t …………………………………………...……………………………. 11. It’s long time since we became close friend. → We have ………………………………………………………………………. 12. Ba began to collect stamps in 2010. → Ba has ….………………………………………………………………………. III. Complete the sentences with “for” or “since”. 1. It has been raining …………….lunchtime. 2. She has lived in London …………… 1990. 3. I have known her ………………January. 4. His father has worked in this company …………. 20 years. 5. Have you learned English …………..a long time ? 6. I haven’t seen Tom ……………we left school. 7. The roon is very dirty. Nobody has cleaned it …………years. 8. We’ve already waited …………five minutes. IV. Complete the sentences with a suitable word below. for since before never ever 1. I haven’t seen my best friend for many months. 2. Sue has ___________ tried Indian food before. 3. Haven’t you seen Pepper Pig _______ ? 4. Mike has studied English _______ 2015. 5. Has Joe __________ told you his brother’s story? 6. We have known Bob ____________ a long time. 7. Tom hasn’t played football ___________ he broke his leg. 8. I haven’t a film ___________ I moved here.