Если не трудно, можно мой ответ поставить, как "лучший" , я старалась))

Ответ:

3. we're going to be

4. I'm going to stay

5. they aren't going to work

6. book's going to fall

7. friend's going to cook

8. we aren't going to buy

9. he's going to study

10. we aren't going to pass

11. they're going to move

12. he isn't going to be