The key answer of exercise 2

a)

1. is
2. is
3. are
4. isn't
5. 's / is
6. are
7. are
8. are
9. aren't
10. is

b)

1. Where are you from?
2. What's your job?
3. Is your brother married?
4. Where is his wife from?
5. Where are Emilia and Pehuen?
6. How old are their children?
7. Are your parents in Brazil?
8. Is their summer house in the city?

c)

1. I’m from Brazil.
2. I’m a pilot.
3. Yes, he is.
4. She's from Poland.
5. They're in Korea.
6. They're fifteen and seventeen.
7. No, they aren’t. They're in Greece.
8. No, it isn’t. It’s in the countryside.