Here are the completed sentences with tag questions:

1. You're going to school tomorrow, **aren't you?**
2. Gary signed the petition, **didn't he?**
3. There's an exam tomorrow, **isn't there?**
4. Beverly will be attending the university in September, **won't she?**
5. She's been studying English for two years, **hasn't she?**
6. It doesn't work, **does it?**
7. He should stay in bed, **shouldn't he?**
8. Let's go fishing, **shall we?**
9. Jill and Joe have been to Mexico, **haven't they?**
10. You and I talked to the professor yesterday, **didn't we?**
11. You will stay in touch, **won't you?**
12. After a couple of years, the heat gets too much, **doesn't it?**
13. You didn't know I was an artist, **did you?**
14. It is quite warm, **isn't it?**
15. That hardly counts, **does it?**
16. Oh, he wants us to make films as well, **doesn't he?**
17. I'll tell you roughly, **won't I?**
18. You rarely see that sort of thing these days, **do you?**
19. Women are very seldom convicted, **are they?**
20. Nobody knows the answer, **do they?**