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3. Must the luggage be checked at the customs?

4. Are postcards sold everywhere?

5. Will the book be finished at 3 o'clock?

Объяснение:

2-there is security in this park

1. isn't she

2. aren't they

3. can't they

4. can't he

5. aren't they

6. has she

7. haven't they

8. can they

9. is he