Ответ:

a)

2. Where are your socks?

3. Um. They're under my bag.

4. And where's your bag?

5. Oh. It's next to my chair.

6. And your magazines. Where are they ?

7. They're in my cupboard.

8. That's good. And your homework ?

9. My homework?

- Yes, Katie. Where's your homework?

10. Oh dear. My homework's on my desk... at school!

b)

2. It's under her bag.

3. It's at school. Или, It's on her desk. (Я думаю, правильнее второе)

4. It's in her cupboard.