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Ex3/
1. It is especially known as Tet Nguyen Dan, or Tet.
2. Yes, it is.
3. It begins between January twenty-first and February nineteen.
4. Vietnamese people tidy their houses, cook special food, clean and make offerings on the family altars.
5. Yes, they do.
6. No, it doesn't.
7. Because Vietnamese people believe that how people act during those days will influence the whole year.

Ex4/
1. In spite of being a poor student, Tom studied very well.
2. Because of being sick, Mary could not go to school.
3. Despite the bad weather, she went to school on time.
4. Because the big storm, I stayed at home.
5. Although Tom's salary was good, he gave up his job.

Ex7/
1. Where did your mum live when she was a girl?
2. What did they use to do when we were small?
3. How much money did they spend on the film?
4. What kind of film is Titanic?
5. When did you go to the Flower Festival in Da Lat?
6. Who bought this T-shirt for me?
7. Why did you enjoy the film?
8. How far is it from your house to your school?
9. How long does it take to get to the school?
10. What do your friends save money for?