I don039;t - Nor do I - I do - So

I don't - Nor do I - I do - So do I

1.A: I never tidy my bedroom.
B: Oh, really?........; it doesn't take a long time.
2.A: I always do my homework.
B: ............... .
3.A: I never watch TV in my free time.
B: ............... .
4.A: I often go to the cinema at weekends.
B: ............... . I hate going to the cinema.