Here are the tags for your sentences:

6. The weather was really nice, **wasn't it?**
7. He’s very handsome, **isn't he?**
8. They weren’t in Paris, **were they?**
9. You aren’t from Japan, **are you?**
10. James is a very smart student, **isn't he?**
11. I like boba tea very much, **don't I?**
12. She doesn’t work in a restaurant, **does she?**
13. They need some milk, **don't they?**
14. We live in a flat, **don't we?**
15. Julie studies very hard every night, **doesn't she?**
16. Don and Anna didn’t take French classes, **did they?**
17. We often come home early, **don't we?**
18. You don’t like spicy food, **do you?**
19. She doesn’t cook very well, **does she?**
20. We don’t watch much TV, **do we?**

These tags help confirm or seek agreement about the statements made in the sentences.