AB=12

BC=\(9\sqrt{2}\)

AC=\(3\sqrt{2}\)

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I like swimming. It is my favorite sport, for I know that it is healthy as well as a good chance for a person to exercise his or her body.
Last Sunday morning, as the weather was fine, I went to Vung Tau with my family. It took us about two hours by car to arrive at our destination, and I felt very excited about it.

When our car reached the top of the cliff overlooking the Bay, I admired the golden sand of the long beach, the blue sky and water, and the splendid country surroundings which looked like an artist’s painting.
We put on our bathing-suits and ran into the water. It was a very happy swim for me. We played ball, challenged each other in swimming a certain distance. Of course, I was always beaten by my bigger brothers but I was satisfied with my good effort. When we felt tired, we lay down on the beach to rest and to have some sunbath. At about noon, we returned to our tent and had lunch.
About 3 p.m. we went once more into the water and swam till 5 p.m. Finally, we got ready to start for home. Everyone was delighted to have spent such a wonderful swim. I really enjoyed swimming very much that day.

My favorite movie is "A Walk To Remember". This is my favorite movie because it deals with real life issues, like some of the most important things in life such as: love, relationships, and most important, who your real friends are. "A Walk To Remember is about a girl named Jamie (Mandy Moore) who is the daughter of a minister who becomes ill. During high school Jamie doesn't have very many friends but is in alot of activities and through that she meets a reckless boy named Landon. Landon got into some trouble which made the principal force him into being in a play for the drama club. Landon Played a lead role as did Jamie, even though they didn't hang out in the same crowd of friends when Landon needed Giúp with his lines in the play he turned to Jamie to Giúp him out. One of the first things she told Landon was for him to promise that he wouldn't fall in love with her. But that is a promise that he did not keep. Jamie finally told Landon that she had cancer and the treatment stoped working so she didn't have very much time to live. Jamie had this list of accomplisments that she wanted to make before she passed. The number one thing was to get married at the same church that her mother and father was married in. Landon made ALL of her dreams come true. But unfortunitally her cancer became worse and she died. I would recommend this movie to anyone who likes heart touching stories, I liked it and would watch it a million times a day if I could.

I am a student at high school. My school is very big and more beautiful. At school, there are many students and teachers. The teachers are very nice andardor.They give me many many books and lessons. Everdday, I go to scool and meet my friends. We try to learn to become good student. We enjoy reading, playing, learning, helping together. In the scholl, I study so much, math, science, History, English , Vietnamese,...
I like English, Chemistry, math. I can sleep when I study. I try alot, if I lazy, my teachers are sad. I love all the day for school and love my teachers so much. Because not people don't love their school. I love it and I know It's love us too. I love my school, my friends, my teachers very much. I can not forget this beloved high school. I will try study to worthy my teachers, my school.

Exercise 4:

1. D 2. B 3. D 4. B 5. D 6. A 7. A 8. C 9. A 10. A

Exercise 3:

1. D. was cooking -> cooked

2. C. catching -> caught

3. D. buys -> bought

4. C. is looking -> was looking

5. B. was sat -> sat

6. D. delete -> deleted

7. C. so do -> so are

8. A. has told -> told

9. C. stop -> stopped

10. D. since -> for

11. A. have seen -> saw

12. C. listen -> listened

13. B. change -> changed

14. D. is still -> was still

15. A. I’m shopping -> was shopping

16. C. is having -> was having

17. C. are -> have been

18. B. are believing -> believe

19. B. had been -> has been

20. C. waking -> wakes

21. D. drives -> was driving

22. D. will certainly complete -> will have certainly completed

23. D. buys -> bought

24. A. We’ll be cycled -> We’ll be cycling

25. D. won’t come -> don’t come

26. A. was knocking -> knocked

27. A. didn’t drink -> hasn’t drunk

28. C. when -> since

29. B. gone -> going

30. A. Did -> Will