The key answer of exercise 2

a)

1. was
2. ages
3. a long time
4. the weekend
5. then

c)

1. How long have you had your phone?
2. How long have you known your best friend?
3. How long have you had your computer or tablet?
4. How long have you lived where you live now?
5. How long have you been in your English class?
6. How long have you been on Facebook or Twitter?