Ex 1: 11. She's satisfied with her present job, so she has decided to leave.

1. During his childhood, his family lived in the United States.
2. Jack London wrote several interesting novels on adventure.
3. He failed the final exam because he didn't make any preparation for it.
4. The custom was said to be a matter of convenience.
5. She is absorbed in her book.
6. As she is so unsatisfied with her present job, she has decided to leave.

Ex 2: Câu 1: We like their friendliness. (D. a&c) Câu 2: The friendship between Vietnam and China is good. (D. friendship) Câu 3: They seem to be unfriendly. We dislike them. (B. friendly) Câu 4: There will be a meeting in this street. (B. meeting) Câu 5: We saw beautiful girls there. (B. beautiful) Câu 6: The garden is beautifully adorned with trees and flowers. (C. beautifully) Câu 7: They enjoy the peaceful atmosphere here. (C. peaceful) Câu 8: The answer is not provided (no answer is correct). Câu 9: In addition, there are other religions. (A. addition) Câu 10: The preservation of old buildings should be taken into consideration. (B. preservation) Câu 11: You have to be aware of the damage humans are doing to quicken the extinction of wildlife. (D. extinction) Câu 12: The language of instruction is Bahasa Malaysia. (A. instruction) Câu 13: The problem of unemployment among young people is hard to solve. (D. unemployment) Câu 14: The examiners will judge you on your quality and performance. (C. examiners) Câu 15: A multinational corporation is a company that operates in more than one country. (C. multinational)

Ex 3:

1. Unfortunately, the barber lucked out and cut my hair too short.
2. Nam is a very sociable person, kind and generous.
3. She has short curly hair.
4. My brother likes acting and outdoor activities, and he demonstrated his successful invention.
5. Bell assisted Watson, didn't he?
6. Thomas Watson was Bell's assistant.
7. "The Lost Shoe" is one of the traditional stories I like best.