Ответ:

1. She will leave for London tomorrow, won't she?

2. She has bought a ticket, hasn't she?

3. We think we are going abroad this summer, aren't we?

4. We have enough money, haven't we?

5. My parents hope I will win the competition, won't I?

6. On Sunday we are arranging a party, aren't we?

7. We have already bought everything, haven't we?

8. I am sure my friend will pass his exams well, won't he?