Here are the tag questions for each of your sentences:

1. She’s from a small town in China, **isn’t she?**
2. He's still sleeping, **isn't he?**
3. We’re late again, **aren’t we?**
4. I’m not the person with the tickets, **am I?**
5. You do go to school, **don't you?**
6. The weather is really bad today, **isn't it?**
7. Let's go for a walk, **shall we?**
8. They aren’t in Mumbai at the moment, **are they?**
9. We won't be late, **will we?**
10. John’s a very good student, **isn't he?**
11. Nobody called, **did they?**
12. She doesn’t work in a hotel, **does she?**
13. They will wash the car, **won't they?**
14. We live in a tiny flat, **don't we?**
15. We must lock the doors, **mustn't we?**
16. David and Julie don’t take Chinese classes, **do they?**
17. I often come home late, **don't I?**
18. I'm right, **aren't I?**
19. She doesn’t cook very often, **does she?**

Feel free to ask if you need more information or help!