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6. We haven't got any plums, but we've got some (b) apples.

7. Vlad (a) is at school.

8. You can meet Vlad (a) at school.

9. Vlad's (b) school is the next to the museum.

10. You can take the second (c) postcard.

11. You can take two (c) postcards.

12. Those students (b) are good at English.